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Finding the Fourth Proportional to 391,505.38, 587,166.17 and 220,800.92

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Solution

The fourth proportional to 391,505.38, 587,166.17 and 220,800.92 is: 331,149.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,505.38 : 587,166.17 = 220,800.92 : x
  2. Step 2: Convert to fraction form
    391,505.38/587,166.17 = 220,800.92/x
  3. Step 3: Cross multiply
    391,505.38x = 587,166.17 × 220,800.92
  4. Step 4: Simplify right side
    391,505.38x = 129,646,828,145.05
  5. Step 5: Solve for x
    x = 129,646,828,145.05/391,505.38
  6. Step 6: Final answer
    x = 331,149.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.