Finding the Third Proportional to 129.50 and 168.25

Step by Step Solution

1. Step 1: Write the proportion equation
   129.50 : 168.25 = 168.25 : x
2. Step 2: Convert to fraction form
   129.50/168.25 = 168.25/x
3. Step 3: Cross multiply
   129.50x = 168.25 × 168.25
4. Step 4: Simplify right side
   129.50x = 28,308.06
5. Step 5: Solve for x
   x = 28,308.06/129.50
6. Step 6: Final answer
   x = 218.60