Final answer:
To find the width of the rectangle, set up a proportion using the given ratio of length to width. Substitute the known length and solve for the width.
Step-by-step explanation:
To solve the problem, we can set up a proportion using the given ratio of length to width. If the ratio of the length to the width is 4 to 3, we can write it as 4/3 = length/width.
Since we are given that the length of the rectangle is 12 feet, we can substitute the values into the proportion: 4/3 = 12/width.
To solve for the width, we can cross multiply and solve the equation: 4 * width = 3 * 12.
Dividing both sides of the equation by 4, we get width = (3 * 12)/4 = 36/4 = 9 feet.
Therefore, the width of the rectangle is 9 feet.