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# Title: The Description and Use Of Two Arithmetick Instruments. Together With a Short Treatise, explaining and Demonstrating the Ordinary Operations of Arithmetick. As likewise, A Perpetual Almanack, And serveral Useful Tables. ... (shelfmark Ob-A 236)
# Folio 73, page id 170380998X:0100
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2
viz. (640) be Dirided by che First, namely
(4) The Ouociene, 2iz. (160) is the Fourch
Proporrional louche.
And For a Proot oF this-
Lecche Fourch found Term (160) beine Mul
ciplyed by che krA (4); ehe Produet rist be che
Tame wich che Product oF che chird Mulcipived by
the second, 2i2. 640.
The Rroumenration is plainly ehus,
IF the Produet oF (80by 8) be equal eo che
ProduetoF (4 by cheuntnoon Number.)
Then,
The Quociene wil be che very Came eherher
PDiride ihe Product ot (50 by 8,) or Wwhecher L
Diride che Produet et (q by che untinonn Num-
b. r) by 4. For cicher ot che Products beine 64C3
checuorient mult necds bc 160.
Buc non ie is monifest, chat il
TMulcipiy 4 by 160, and Diride the Produet
back again br 43 ic will gire 160 Forche Duotient.
Becaule, wharerer Muiciplicarion doch, is again
undone by Dirition. And this is che crue and
eenuire Reason oF che Operarion in This Rule ef
Three.
Thac