Answer
500 ft
Work Step by Step
Write a proportion. Height is to height as length is to length.
$\frac{x}{25}=\frac{40}{2}$ $\longrightarrow$cross multiply to solve for x
$2x=40\times25$ $\longrightarrow$multiply
$2x=1000$ $\longrightarrow$multiplication property of equality
$2x\div2=1000\div2$ $\longrightarrow$divide
$x=500$
