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Finding the Fourth Proportional to 721,001.13, 994,988.03 and 398,733

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Solution

The fourth proportional to 721,001.13, 994,988.03 and 398,733 is: 550,255.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,001.13 : 994,988.03 = 398,733 : x
  2. Step 2: Convert to fraction form
    721,001.13/994,988.03 = 398,733/x
  3. Step 3: Cross multiply
    721,001.13x = 994,988.03 × 398,733
  4. Step 4: Simplify right side
    721,001.13x = 396,734,560,172.33
  5. Step 5: Solve for x
    x = 396,734,560,172.33/721,001.13
  6. Step 6: Final answer
    x = 550,255.12

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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.