Finding the Third Proportional to 31.43 and 51.89

Step by Step Solution

1. Step 1: Write the proportion equation
   31.43 : 51.89 = 51.89 : x
2. Step 2: Convert to fraction form
   31.43/51.89 = 51.89/x
3. Step 3: Cross multiply
   31.43x = 51.89 × 51.89
4. Step 4: Simplify right side
   31.43x = 2,692.64
5. Step 5: Solve for x
   x = 2,692.64/31.43
6. Step 6: Final answer
   x = 85.67