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Finding the Third Proportional to 81,691 and 175,897

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Solution

The third proportional to 81,691 and 175,897 is: 378,741.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,691 : 175,897 = 175,897 : x
  2. Step 2: Convert to fraction form
    81,691/175,897 = 175,897/x
  3. Step 3: Cross multiply
    81,691x = 175,897 × 175,897
  4. Step 4: Simplify right side
    81,691x = 30,939,754,609
  5. Step 5: Solve for x
    x = 30,939,754,609/81,691
  6. Step 6: Final answer
    x = 378,741.29

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.