#### Answer

$x=4$

#### Work Step by Step

We are given the proportion $\frac{1}{3}=\frac{x}{12}$. We can setting the cross products equal to each other and solving for the unknown variable.
$1\times12=3\times x$
$12=3x$
Divide both sides by 3.
$x=4$

Published by
Pearson

ISBN 10:
0321825535

ISBN 13:
978-0-32182-553-7

$x=4$

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