Finding the Third Proportional to 55.50 and 67.31

Step by Step Solution

1. Step 1: Write the proportion equation
   55.50 : 67.31 = 67.31 : x
2. Step 2: Convert to fraction form
   55.50/67.31 = 67.31/x
3. Step 3: Cross multiply
   55.50x = 67.31 × 67.31
4. Step 4: Simplify right side
   55.50x = 4,530.97
5. Step 5: Solve for x
   x = 4,530.97/55.50
6. Step 6: Final answer
   x = 81.64