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Finding the Fourth Proportional to 391,129.20, 587,221.80 and 251,161.20

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Solution

The fourth proportional to 391,129.20, 587,221.80 and 251,161.20 is: 377,080.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,129.20 : 587,221.80 = 251,161.20 : x
  2. Step 2: Convert to fraction form
    391,129.20/587,221.80 = 251,161.20/x
  3. Step 3: Cross multiply
    391,129.20x = 587,221.80 × 251,161.20
  4. Step 4: Simplify right side
    391,129.20x = 147,487,331,954.16
  5. Step 5: Solve for x
    x = 147,487,331,954.16/391,129.20
  6. Step 6: Final answer
    x = 377,080.85

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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.