Home / 728,711,195.32-1,005,645,431.10-398,678,781.88

Finding the Fourth Proportional to 728,711,195.32, 1,005,645,431.10 and 398,678,781.88

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Solution

The fourth proportional to 728,711,195.32, 1,005,645,431.10 and 398,678,781.88 is: 550,189,839.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    728,711,195.32 : 1,005,645,431.10 = 398,678,781.88 : x
  2. Step 2: Convert to fraction form
    728,711,195.32/1,005,645,431.10 = 398,678,781.88/x
  3. Step 3: Cross multiply
    728,711,195.32x = 1,005,645,431.10 × 398,678,781.88
  4. Step 4: Simplify right side
    728,711,195.32x = 400,929,495,474,135,488
  5. Step 5: Solve for x
    x = 400,929,495,474,135,488/728,711,195.32
  6. Step 6: Final answer
    x = 550,189,839.33

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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.