Answer
To do the proof, we simplify the expression, first using cross multiplication.
$\frac{a}{b} = \frac{c}{d} \\ ad = bc \\ \frac{a}{c} = \frac{b}{d}$
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 5 - Section 5.1 - Ratios, Rates, and Proportions - Exercises - Page 227: 38
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