Final answer:
To find the side length of the smaller square, set up a proportion using the ratio of perimeters.
Step-by-step explanation:
The side length of the smaller square can be found using the given ratio of perimeters. The ratio of perimeters is 4:9, and the perimeter of the larger square is 108 feet. To find the perimeter of the smaller square, we can set up a proportion:
4/9 = x/108
Cross multiplying, we get:
9x = 432
Dividing both sides by 9, we find that x = 48. Therefore, the side length of the smaller square is 48 feet.