11:22::13:X ?

Ratios and Proportions:- Product of Means = Product of Extremes 22 * 13 = 11 * X X = (22 * 13) / 11 X = 26 OR 11/22 = 13/X 1/2 = 13/X X = 13 * 2 X = 26 Hope it Helps!