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Finding the Fourth Proportional to 391,047.20, 584,821.20 and 328,061.60

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Solution

The fourth proportional to 391,047.20, 584,821.20 and 328,061.60 is: 490,624.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,047.20 : 584,821.20 = 328,061.60 : x
  2. Step 2: Convert to fraction form
    391,047.20/584,821.20 = 328,061.60/x
  3. Step 3: Cross multiply
    391,047.20x = 584,821.20 × 328,061.60
  4. Step 4: Simplify right side
    391,047.20x = 191,857,378,585.92
  5. Step 5: Solve for x
    x = 191,857,378,585.92/391,047.20
  6. Step 6: Final answer
    x = 490,624.61

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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.