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Finding the Third Proportional to 65,387 and 138,621

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Solution

The third proportional to 65,387 and 138,621 is: 293,877.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,387 : 138,621 = 138,621 : x
  2. Step 2: Convert to fraction form
    65,387/138,621 = 138,621/x
  3. Step 3: Cross multiply
    65,387x = 138,621 × 138,621
  4. Step 4: Simplify right side
    65,387x = 19,215,781,641
  5. Step 5: Solve for x
    x = 19,215,781,641/65,387
  6. Step 6: Final answer
    x = 293,877.71

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.