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Finding the Fourth Proportional to 721,517.22, 995,694.93 and 399,240.90

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Solution

The fourth proportional to 721,517.22, 995,694.93 and 399,240.90 is: 550,953.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,517.22 : 995,694.93 = 399,240.90 : x
  2. Step 2: Convert to fraction form
    721,517.22/995,694.93 = 399,240.90/x
  3. Step 3: Cross multiply
    721,517.22x = 995,694.93 × 399,240.90
  4. Step 4: Simplify right side
    721,517.22x = 397,522,139,978.64
  5. Step 5: Solve for x
    x = 397,522,139,978.64/721,517.22
  6. Step 6: Final answer
    x = 550,953.09

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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.