Question 497097
The ratio would add up to a perimeter of 30, so your perimeter is 15; each side will be in the same ratio of 1:2

5* 1/2 = 2.5 inches
12 * 1/2 = 6 inches
13 * 1/2 = 6.5 inches

2.5 + 6 + 6.5 = 15 inches.
This does check, Cleomenius.