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Finding the Fourth Proportional to 721.11, 995.17 and 406.39

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Solution

The fourth proportional to 721.11, 995.17 and 406.39 is: 560.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.11 : 995.17 = 406.39 : x
  2. Step 2: Convert to fraction form
    721.11/995.17 = 406.39/x
  3. Step 3: Cross multiply
    721.11x = 995.17 × 406.39
  4. Step 4: Simplify right side
    721.11x = 404,426.94
  5. Step 5: Solve for x
    x = 404,426.94/721.11
  6. Step 6: Final answer
    x = 560.84

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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.