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Finding the Fourth Proportional to 721,163.40, 995,086.56 and 398,810.52

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Solution

The fourth proportional to 721,163.40, 995,086.56 and 398,810.52 is: 550,292.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,163.40 : 995,086.56 = 398,810.52 : x
  2. Step 2: Convert to fraction form
    721,163.40/995,086.56 = 398,810.52/x
  3. Step 3: Cross multiply
    721,163.40x = 995,086.56 × 398,810.52
  4. Step 4: Simplify right side
    721,163.40x = 396,850,988,438.61
  5. Step 5: Solve for x
    x = 396,850,988,438.61/721,163.40
  6. Step 6: Final answer
    x = 550,292.75

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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.