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Finding the Fourth Proportional to 391,455.11, 587,174.16 and 125,214.83

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Solution

The fourth proportional to 391,455.11, 587,174.16 and 125,214.83 is: 187,819.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,455.11 : 587,174.16 = 125,214.83 : x
  2. Step 2: Convert to fraction form
    391,455.11/587,174.16 = 125,214.83/x
  3. Step 3: Cross multiply
    391,455.11x = 587,174.16 × 125,214.83
  4. Step 4: Simplify right side
    391,455.11x = 73,522,912,360.38
  5. Step 5: Solve for x
    x = 73,522,912,360.38/391,455.11
  6. Step 6: Final answer
    x = 187,819.52

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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.