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Finding the Third Proportional to 391,272 and 621,927

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Solution

The third proportional to 391,272 and 621,927 is: 988,553.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,272 : 621,927 = 621,927 : x
  2. Step 2: Convert to fraction form
    391,272/621,927 = 621,927/x
  3. Step 3: Cross multiply
    391,272x = 621,927 × 621,927
  4. Step 4: Simplify right side
    391,272x = 386,793,193,329
  5. Step 5: Solve for x
    x = 386,793,193,329/391,272
  6. Step 6: Final answer
    x = 988,553.21

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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.