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
$\frac{a}{c}$ =$\frac{b}{d}$
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