Find the percent of increase from 4.5 inches to 13.5 inches.

Step 1: First, you need to find the amount of increase. You do this by subtracting the original number (4.5 inches) from the new number (13.5 inches).

13.5 - 4.5 = 9 inches

Step 2: Next, you need to divide the amount of increase (9 inches) by the original number (4.5 inches).

9 ÷ 4.5 = 2

Step 3: Finally, to convert this number into a percentage, you multiply by 100.

2 x 100 = 200%

So, the percent of increase from 4.5 inches to 13.5 inches is 200%.