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Finding the Fourth Proportional to 721,088.33, 995,084.91 and 398,791.49

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Solution

The fourth proportional to 721,088.33, 995,084.91 and 398,791.49 is: 550,322.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,088.33 : 995,084.91 = 398,791.49 : x
  2. Step 2: Convert to fraction form
    721,088.33/995,084.91 = 398,791.49/x
  3. Step 3: Cross multiply
    721,088.33x = 995,084.91 × 398,791.49
  4. Step 4: Simplify right side
    721,088.33x = 396,831,388,959.99
  5. Step 5: Solve for x
    x = 396,831,388,959.99/721,088.33
  6. Step 6: Final answer
    x = 550,322.86

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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.