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Finding the Third Proportional to 38,291 and 81,128

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Solution

The third proportional to 38,291 and 81,128 is: 171,887.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,291 : 81,128 = 81,128 : x
  2. Step 2: Convert to fraction form
    38,291/81,128 = 81,128/x
  3. Step 3: Cross multiply
    38,291x = 81,128 × 81,128
  4. Step 4: Simplify right side
    38,291x = 6,581,752,384
  5. Step 5: Solve for x
    x = 6,581,752,384/38,291
  6. Step 6: Final answer
    x = 171,887.71

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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.