To find the ratios that are equivalent to 4/5, amplify the fraction, it means multiply both the numerator and the denominator by the same number.
[tex]\frac{4}{5}\cdot\frac{2}{2}=\frac{8}{10}[/tex][tex]\frac{4}{5}\cdot\frac{3}{3}=\frac{12}{15}[/tex][tex]\frac{4}{5}\cdot\frac{9}{9}=\frac{36}{45}[/tex]8/10, 12/15 and 36/45 are equivalent ratios to 4/5.