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Finding the Third Proportional to 87,282 and 138,430

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Solution

The third proportional to 87,282 and 138,430 is: 219,551.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,282 : 138,430 = 138,430 : x
  2. Step 2: Convert to fraction form
    87,282/138,430 = 138,430/x
  3. Step 3: Cross multiply
    87,282x = 138,430 × 138,430
  4. Step 4: Simplify right side
    87,282x = 19,162,864,900
  5. Step 5: Solve for x
    x = 19,162,864,900/87,282
  6. Step 6: Final answer
    x = 219,551.17

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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.