Finding the Third Proportional to 102.50 and 215.50

Step by Step Solution

1. Step 1: Write the proportion equation
   102.50 : 215.50 = 215.50 : x
2. Step 2: Convert to fraction form
   102.50/215.50 = 215.50/x
3. Step 3: Cross multiply
   102.50x = 215.50 × 215.50
4. Step 4: Simplify right side
   102.50x = 46,440.25
5. Step 5: Solve for x
   x = 46,440.25/102.50
6. Step 6: Final answer
   x = 453.08