Schott, Gaspar, Mechanica hydraulico-pneumatica. Pars I. Mechanicae Hydraulico-pnevmaticae Theoriam continet. , 1657
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              <s>
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              bet, ſive ſecunda, aut media. </s>
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              Deinde ductâ rectâ AB, aga­
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              tur illi ex C parallela CD,
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              occurrensipſi AE productæ,
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              in D; eritque ED tertia
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              proportionalis quæſita. </s>
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              Annotatio.
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              SI duæ datæſint nimis longæ, ſervetur id, quod diximus in Annota­
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              tione Propoſitionis quartæ præcedentis.
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              Propoſitio VII.
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              Datis tribus numeris, invenire quartum pro­
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              portionalem.
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              Numeris
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              tribus datis
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              quartum
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              proportiona­
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              lem inveni­
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              re.
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              <s>UTere Regulâ proportionum apud Arithmeticos notiſſima,
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              quam Auteam vocant; & habebis intentum. </s>
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              Propoſitio VIII.
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              Datis tribus rectia lineis, quartam propor­
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              tionaleminvenirc.
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              Lineis tri­
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              bus datis,
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                <expan abbr="quartã">quartam</expan>
              pro­
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              portiona­
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              lem inveni­
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              re.
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              <s>SInt tres lineæ rectæ, AB, BC,
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              AD, quibus invenienda ſit
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              quarta. proportionalis, ad
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              quàm ſit tertia AD, ut eſt
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              prima AB, ad ſecundam BC. </s>
              <s>
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                <expan abbr="Diſponãtur">Diſponantur</expan>
              primæ duæ, AB,
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              BC, ſecundùm lineam
                <expan abbr="rectã">rectam</expan>
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              quæ ſit AC; tertia verò AD,
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              cum prima AB, faciatangulum A quemcunque: deinde ex B
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              ad D ducatur recta BD, cui per C ducatur parallela CE, oc­
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              currens rectæ AD productæ, in E puncto. </s>
              <s>Dico, DE, eſſe
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              quartam proportionalem. </s>
              <s>Demonſtrationem vide apud
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              Euclidem lib. 6. Propoſit. 12. </s>
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