If the ratio of the posters' perimeter is 4:5 and the larger one is 85 inches, then we may want to know how much is one "part" of the ratio - so we divide 85 by 5:
85 / 5 = 17
So the larger poster is 5 * 17 = 85, and the smaller one is 4 * 17 = 68.
The small poster's perimeter can be found using the scale factor of 4:5. The large poster's perimeter is 85 inches, allowing us to determine that the small poster's perimeter is 68 inches. This is calculated as 4 parts of the small poster each measuring 17 inches, totaling 68 inches.
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