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Finding the Fourth Proportional to 391,488.20, 587,232.30 and 339,000.20

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Solution

The fourth proportional to 391,488.20, 587,232.30 and 339,000.20 is: 508,500.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,488.20 : 587,232.30 = 339,000.20 : x
  2. Step 2: Convert to fraction form
    391,488.20/587,232.30 = 339,000.20/x
  3. Step 3: Cross multiply
    391,488.20x = 587,232.30 × 339,000.20
  4. Step 4: Simplify right side
    391,488.20x = 199,071,867,146.46
  5. Step 5: Solve for x
    x = 199,071,867,146.46/391,488.20
  6. Step 6: Final answer
    x = 508,500.30

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Similar ratio
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1.5x scale

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.