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Finding the Third Proportional to 51,372 and 81,512

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Solution

The third proportional to 51,372 and 81,512 is: 129,335.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,372 : 81,512 = 81,512 : x
  2. Step 2: Convert to fraction form
    51,372/81,512 = 81,512/x
  3. Step 3: Cross multiply
    51,372x = 81,512 × 81,512
  4. Step 4: Simplify right side
    51,372x = 6,644,206,144
  5. Step 5: Solve for x
    x = 6,644,206,144/51,372
  6. Step 6: Final answer
    x = 129,335.17

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.