Finding the Third Proportional to 55.31 and 64.50

Step by Step Solution

1. Step 1: Write the proportion equation
   55.31 : 64.50 = 64.50 : x
2. Step 2: Convert to fraction form
   55.31/64.50 = 64.50/x
3. Step 3: Cross multiply
   55.31x = 64.50 × 64.50
4. Step 4: Simplify right side
   55.31x = 4,160.25
5. Step 5: Solve for x
   x = 4,160.25/55.31
6. Step 6: Final answer
   x = 75.21