What is the ratio of my replica to real size? My drawing of a billboard is 5 inches by 10 inches, and it is a replica of a billboard that is 10 feet by 20 feet... what is the ratio between these two sizes? How do I calculate that? Change the feet to inches Drawing = 5 in. x 10 in. Actual = 10 ft x 20 ft > 120 in. x 240 in {changed feet to inches} 5/120 x 10/240 {width and length of drawing over width and length of actual} = 1/24 x 1/24 {ratio of widths and lengths, in inches, reduced} The ratio is 1:24 © Algebra House
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