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Finding the Third Proportional to 80,978 and 129,372

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Solution

The third proportional to 80,978 and 129,372 is: 206,687.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,978 : 129,372 = 129,372 : x
  2. Step 2: Convert to fraction form
    80,978/129,372 = 129,372/x
  3. Step 3: Cross multiply
    80,978x = 129,372 × 129,372
  4. Step 4: Simplify right side
    80,978x = 16,737,114,384
  5. Step 5: Solve for x
    x = 16,737,114,384/80,978
  6. Step 6: Final answer
    x = 206,687.18

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