Answer
$\frac{b}{a}$ =$\frac{d}{c}$ and
$\frac{a}{c}$ =$\frac{b}{d}$
Work Step by Step
$\frac{a}{b}$ =$\frac{c}{d}$ Other true proportions are
$\frac{b}{a}$ =$\frac{d}{c}$ and
$\frac{a}{c}$ =$\frac{b}{d}$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 6 - Section 6.2 - Proportions - Exercise Set - Page 428: 81
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