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Finding the Fourth Proportional to 391,320.70, 587,693.85 and 342,331.90

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Solution

The fourth proportional to 391,320.70, 587,693.85 and 342,331.90 is: 514,121.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,320.70 : 587,693.85 = 342,331.90 : x
  2. Step 2: Convert to fraction form
    391,320.70/587,693.85 = 342,331.90/x
  3. Step 3: Cross multiply
    391,320.70x = 587,693.85 × 342,331.90
  4. Step 4: Simplify right side
    391,320.70x = 201,186,352,288.82
  5. Step 5: Solve for x
    x = 201,186,352,288.82/391,320.70
  6. Step 6: Final answer
    x = 514,121.42

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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.