Answer
46 ft
Work Step by Step
Write a proportion. Height is to height as length is to length.
$\frac{6}{x}=\frac{9}{69}$ $\longrightarrow$cross multiply to solve for x
$9x=6\times69$ $\longrightarrow$multiply
$9x=414$ $\longrightarrow$multiplication property of equality
$9x\div9=414\div9$ $\longrightarrow$divide
$x=46$
