Equivalent ratios, sometimes known as equivalent fractions, are ratios that have the same proportion to each other when put in simplest form. Let's take the following ratios as a quick example.
We know each of these fractions has the same ratio between the numerators and the denominators. They all equal ½ when put in simplest form.
Equivalent ratios have the same unit rate or constant of proportionality. For example, when we compare the denominators of the fractions above to the numerators, we see that the unit rate or ratio is 2.