Finding the Third Proportional to 82.90 and 131.31

Step by Step Solution

1. Step 1: Write the proportion equation
   82.90 : 131.31 = 131.31 : x
2. Step 2: Convert to fraction form
   82.90/131.31 = 131.31/x
3. Step 3: Cross multiply
   82.90x = 131.31 × 131.31
4. Step 4: Simplify right side
   82.90x = 17,241.95
5. Step 5: Solve for x
   x = 17,241.95/82.90
6. Step 6: Final answer
   x = 207.99