Finding the Third Proportional to 111.50 and 131.25

Step by Step Solution

1. Step 1: Write the proportion equation
   111.50 : 131.25 = 131.25 : x
2. Step 2: Convert to fraction form
   111.50/131.25 = 131.25/x
3. Step 3: Cross multiply
   111.50x = 131.25 × 131.25
4. Step 4: Simplify right side
   111.50x = 17,226.56
5. Step 5: Solve for x
   x = 17,226.56/111.50
6. Step 6: Final answer
   x = 154.50