An equivalent ratio is a ratio that expresses the same relationship between two quantities, even if the numbers are different. For example, the ratios 1:2 and 2:4 are equivalent.

To find an equivalent ratio, you can multiply or divide both terms of the ratio by the same non-zero number. For example, to find an equivalent ratio of 2:3, you can multiply both terms by 2 to get 4:6.

The ratio of ice cream cones to brownies is 5:3.

To solve a proportion, you can cross-multiply the terms and then solve for the unknown variable. For example, in the proportion a/b = c/d, you can cross-multiply to get ad = bc.

The formula is: if a/b = c/x, then x = (b * c) / a.

If 24 brownies were sold, then 40 ice cream cones were sold.

Solving for x in a proportion means finding the value of x that makes the two ratios equal.