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Finding the Fourth Proportional to 721.34, 995.38 and 426.61

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Solution

The fourth proportional to 721.34, 995.38 and 426.61 is: 588.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.34 : 995.38 = 426.61 : x
  2. Step 2: Convert to fraction form
    721.34/995.38 = 426.61/x
  3. Step 3: Cross multiply
    721.34x = 995.38 × 426.61
  4. Step 4: Simplify right side
    721.34x = 424,639.06
  5. Step 5: Solve for x
    x = 424,639.06/721.34
  6. Step 6: Final answer
    x = 588.68

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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.