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Finding the Fourth Proportional to 721,679.20, 995,892.72 and 399,402.88

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Solution

The fourth proportional to 721,679.20, 995,892.72 and 399,402.88 is: 551,162.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,679.20 : 995,892.72 = 399,402.88 : x
  2. Step 2: Convert to fraction form
    721,679.20/995,892.72 = 399,402.88/x
  3. Step 3: Cross multiply
    721,679.20x = 995,892.72 × 399,402.88
  4. Step 4: Simplify right side
    721,679.20x = 397,762,420,539.03
  5. Step 5: Solve for x
    x = 397,762,420,539.03/721,679.20
  6. Step 6: Final answer
    x = 551,162.37

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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.