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Finding the Fourth Proportional to 721,697.76, 995,929.20 and 399,408.12

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Solution

The fourth proportional to 721,697.76, 995,929.20 and 399,408.12 is: 551,175.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,697.76 : 995,929.20 = 399,408.12 : x
  2. Step 2: Convert to fraction form
    721,697.76/995,929.20 = 399,408.12/x
  3. Step 3: Cross multiply
    721,697.76x = 995,929.20 × 399,408.12
  4. Step 4: Simplify right side
    721,697.76x = 397,782,209,425.10
  5. Step 5: Solve for x
    x = 397,782,209,425.10/721,697.76
  6. Step 6: Final answer
    x = 551,175.62

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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.