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Finding the Fourth Proportional to 721,100, 995,078.85 and 398,791.28

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Solution

The fourth proportional to 721,100, 995,078.85 and 398,791.28 is: 550,310.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,100 : 995,078.85 = 398,791.28 : x
  2. Step 2: Convert to fraction form
    721,100/995,078.85 = 398,791.28/x
  3. Step 3: Cross multiply
    721,100x = 995,078.85 × 398,791.28
  4. Step 4: Simplify right side
    721,100x = 396,828,768,292.43
  5. Step 5: Solve for x
    x = 396,828,768,292.43/721,100
  6. Step 6: Final answer
    x = 550,310.32

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1.5x scale

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.