The units are consistent across numerators and denominators. Express each ratio as a simplified fraction. $\displaystyle\frac{{9}}{{24}}=\frac{{3}}{{8}}\usepackage{cmbright}\Huge\$ and $\displaystyle\frac{{36}}{{96}}=\frac{{3}}{{8}}\usepackage{cmbright}\Huge\$ . Because $\displaystyle\frac{{3}}{{8}}=\frac{{3}}{{8}}\usepackage{cmbright}\Huge\$ , the proportion is true.