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Finding the Fourth Proportional to 578,708.72, 868,624.20 and 279,400.40

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Solution

The fourth proportional to 578,708.72, 868,624.20 and 279,400.40 is: 419,371.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,708.72 : 868,624.20 = 279,400.40 : x
  2. Step 2: Convert to fraction form
    578,708.72/868,624.20 = 279,400.40/x
  3. Step 3: Cross multiply
    578,708.72x = 868,624.20 × 279,400.40
  4. Step 4: Simplify right side
    578,708.72x = 242,693,948,929.68
  5. Step 5: Solve for x
    x = 242,693,948,929.68/578,708.72
  6. Step 6: Final answer
    x = 419,371.51

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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.