Compute the cross products: $\displaystyle{20}\cdot{98}={1},{960}\usepackage{cmbright}\Huge\$ and $\displaystyle{48}\cdot{40}={1},{920}\usepackage{cmbright}\Huge\$ . Because $\displaystyle{1},{960}\ne{1},{920}\usepackage{cmbright}\Huge\$ , the proportion is false.