Valerio, Luca
,
De centro gravitatis solidorum
,
1604
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quantacumque magnitudine propoſita, nomina
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tam habuerit proportionem; prima ad ſecundam
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eandem nominatam habebit proportionem. </
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<
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>Sint duæ magnitudines A, B duarum autem aliarum
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EF vnà maiorum, vel minorum quàm AB minori ex
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ceſsu vel defectu quantacumque magnitudine propo
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ſita, habeat E maior vel minor quàm A ad F vnà
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maiorem, vel minorem quàm B certam ali quam nomina
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tam proportionem, verbi gratia, ſeſquialteram. </
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<
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>Dico A
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ad B, eandem nominatam habere proportionem: vt A
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ipſius B eſse ſeſquialteram. </
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<
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>Quoniam
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enim omnis proportio in aliquibus ma
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gnitudinibus conſiſtit; ſit magnitudo C
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ipſius D ſeſquialtera: ſed & E eſt ipſius
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F ſeſquialtera; vtigitur C, tertia ad D
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quartam, ita erit E maior, vel minor quàm
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A prima, ad F vnà maiorem, vel minorem
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ſecunda, minori, vt ponitur, vtriuſque ex
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ceſsu, vel defectu magnitudine propoſita
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eiuſdem generis cum A, B, quæcumque
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illa, & quantacumque ſit; erit per præ
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cedentem eadem proportio A ad B,
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quæ C ad D: ſed proportio quam ha
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bet C ad D, eſt ſeſquialtera; ergo & A
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ipſius B erit ſeſquialtera. </
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<
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>Similiter quo
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cumque alio nomine notatam proportio
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nem habeat E ad F, eandem habere A
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ad B, oſtenderemus, vt duplam, ſeſquitertiam, alicuius du
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plicatam, vel triplicatam, & ſic de ſingulis. </
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<
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>Manifeſtum
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eſt igitur propoſitum. </
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<
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>Hæc autem propoſitio in paucis exemplaribus, quæ do
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no quibuſdam
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, non extat; poſterius enim eam exco-</
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