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Finding the Fourth Proportional to 721,680.20, 995,894.10 and 399,403.88

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Solution

The fourth proportional to 721,680.20, 995,894.10 and 399,403.88 is: 551,163.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,680.20 : 995,894.10 = 399,403.88 : x
  2. Step 2: Convert to fraction form
    721,680.20/995,894.10 = 399,403.88/x
  3. Step 3: Cross multiply
    721,680.20x = 995,894.10 × 399,403.88
  4. Step 4: Simplify right side
    721,680.20x = 397,763,967,609.11
  5. Step 5: Solve for x
    x = 397,763,967,609.11/721,680.20
  6. Step 6: Final answer
    x = 551,163.75

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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.