Answer
$\frac{5}{12}$
Work Step by Step
$\frac{1}{3}$ $\times$ $\frac{4}{4}$ + f $\times$ $\frac{12}{12}$ = $\frac{3}{4}$ $\times$ $\frac{3}{3}$
$\frac{4}{12}$ + $\frac{12f}{12}$ = $\frac{9}{12}$
4 + 12f = 9
12f = 5
f = $\frac{5}{12}$
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