Answer
$x=2\frac{1}{4}$
Work Step by Step
$\frac{3}{16}=\frac{x}{12}$ multiply both sides by 12
$\frac{3}{16}\times12=\frac{x}{12}\times12$ simplify
$\frac{36}{16}=x$ reduce
$2\frac{4}{16}=x$ reduce
$2\frac{1}{4}=x$
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