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Finding the Fourth Proportional to 396,499.87, 547,155.15 and 215,207.90

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Solution

The fourth proportional to 396,499.87, 547,155.15 and 215,207.90 is: 296,978.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,499.87 : 547,155.15 = 215,207.90 : x
  2. Step 2: Convert to fraction form
    396,499.87/547,155.15 = 215,207.90/x
  3. Step 3: Cross multiply
    396,499.87x = 547,155.15 × 215,207.90
  4. Step 4: Simplify right side
    396,499.87x = 117,752,110,805.69
  5. Step 5: Solve for x
    x = 117,752,110,805.69/396,499.87
  6. Step 6: Final answer
    x = 296,978.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.