## Prealgebra (7th Edition)

$x=560\ ft$
$\frac{28}{x}=\frac{5}{100}$ $\longrightarrow$cross multiply to solve for x $5x=28\times100$ $\longrightarrow$multiply $5x=2800$ $\longrightarrow$ multiplication property of equality $5x\div5=2800\div5$ $\longrightarrow$divide $x=560$