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Finding the Fourth Proportional to 391,504.80, 587,257.20 and 220,262.70

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Solution

The fourth proportional to 391,504.80, 587,257.20 and 220,262.70 is: 330,394.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,504.80 : 587,257.20 = 220,262.70 : x
  2. Step 2: Convert to fraction form
    391,504.80/587,257.20 = 220,262.70/x
  3. Step 3: Cross multiply
    391,504.80x = 587,257.20 × 220,262.70
  4. Step 4: Simplify right side
    391,504.80x = 129,350,856,466.44
  5. Step 5: Solve for x
    x = 129,350,856,466.44/391,504.80
  6. Step 6: Final answer
    x = 330,394.05

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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.