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Finding the Fourth Proportional to 721,785.64, 996,052.10 and 399,488.88

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Solution

The fourth proportional to 721,785.64, 996,052.10 and 399,488.88 is: 551,287.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,785.64 : 996,052.10 = 399,488.88 : x
  2. Step 2: Convert to fraction form
    721,785.64/996,052.10 = 399,488.88/x
  3. Step 3: Cross multiply
    721,785.64x = 996,052.10 × 399,488.88
  4. Step 4: Simplify right side
    721,785.64x = 397,911,737,850.65
  5. Step 5: Solve for x
    x = 397,911,737,850.65/721,785.64
  6. Step 6: Final answer
    x = 551,287.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.