I'm not sure but I think it's the right answer.
15.0424123723
Draw 4 squares. The perimeter is 10 because the width is 4 and the length is 1. So 4 x 2 is 8 and 1 x 2 is 2. And 8 + 2 = 10.
For example, to find two ratios that are equal to 1:7, first write 1:7 as the fraction 1/7. ... Next, multiply both the numerator and denominator of 1/7 by 2, to get 2/14, or 2:14, and multiply the numerator and denominator of 1/7 by 3, to get 3/21, or 3:21.