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Finding the Fourth Proportional to 676,400.32, 1,012,990 and 391,490.92

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Solution

The fourth proportional to 676,400.32, 1,012,990 and 391,490.92 is: 586,304.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    676,400.32 : 1,012,990 = 391,490.92 : x
  2. Step 2: Convert to fraction form
    676,400.32/1,012,990 = 391,490.92/x
  3. Step 3: Cross multiply
    676,400.32x = 1,012,990 × 391,490.92
  4. Step 4: Simplify right side
    676,400.32x = 396,576,387,050.80
  5. Step 5: Solve for x
    x = 396,576,387,050.80/676,400.32
  6. Step 6: Final answer
    x = 586,304.26

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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.