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Finding the Fourth Proportional to 391,480.20, 587,450.70 and 142,129.80

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Solution

The fourth proportional to 391,480.20, 587,450.70 and 142,129.80 is: 213,278.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,480.20 : 587,450.70 = 142,129.80 : x
  2. Step 2: Convert to fraction form
    391,480.20/587,450.70 = 142,129.80/x
  3. Step 3: Cross multiply
    391,480.20x = 587,450.70 × 142,129.80
  4. Step 4: Simplify right side
    391,480.20x = 83,494,250,500.86
  5. Step 5: Solve for x
    x = 83,494,250,500.86/391,480.20
  6. Step 6: Final answer
    x = 213,278.35

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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.