Finding the Third Proportional to 116.75 and 128.30

Step by Step Solution

1. Step 1: Write the proportion equation
   116.75 : 128.30 = 128.30 : x
2. Step 2: Convert to fraction form
   116.75/128.30 = 128.30/x
3. Step 3: Cross multiply
   116.75x = 128.30 × 128.30
4. Step 4: Simplify right side
   116.75x = 16,461.59
5. Step 5: Solve for x
   x = 16,461.59/116.75
6. Step 6: Final answer
   x = 140.99