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Finding the Fourth Proportional to 721,140.52, 995,168.88 and 398,838.70

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Solution

The fourth proportional to 721,140.52, 995,168.88 and 398,838.70 is: 550,394.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,140.52 : 995,168.88 = 398,838.70 : x
  2. Step 2: Convert to fraction form
    721,140.52/995,168.88 = 398,838.70/x
  3. Step 3: Cross multiply
    721,140.52x = 995,168.88 × 398,838.70
  4. Step 4: Simplify right side
    721,140.52x = 396,911,862,379.66
  5. Step 5: Solve for x
    x = 396,911,862,379.66/721,140.52
  6. Step 6: Final answer
    x = 550,394.62

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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.