Answer
5 ft
Work Step by Step
Pitch is defined as $\frac{rise}{run}$.
Create a proportion using ratios of rise:run.
$\frac{1}{3}=\frac{x}{15}$
Set the product of the means equal to the product of the extremes and solve for the variable.
$3\times x=1\times 15$
$3x=15$
$3x\div3=15\div3$
$x=5$