Consider the enlargement of the rectangle. A smaller rectangle with length of x inches and width of 3/5 inch. A larger rectangle with length of 20 inches and width of 12 inches.

Use the proportion to find the missing dimension of the original rectangle.
1. Set up the proportion: x/(3/5) = 20/12
2. Use cross products: 12(x) = 20(3/5)

3. Simplify:
12x = ?
4. Divide:
x = ?