Correct. The sides on the left are corresponding. The tops are corresponding sides also. This gives you the proportion $\displaystyle\frac{{5}}{{6}}=\frac{{12}}{{n}}\usepackage{cmbright}\Huge\$

Solve the equation:

$\displaystyle{5}{n}={72}\usepackage{cmbright}\Huge\$

$\displaystyle{n}={14.4}\usepackage{cmbright}\Huge\$