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Finding the Fourth Proportional to 721.25, 994.87 and 426.31

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Solution

The fourth proportional to 721.25, 994.87 and 426.31 is: 588.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.25 : 994.87 = 426.31 : x
  2. Step 2: Convert to fraction form
    721.25/994.87 = 426.31/x
  3. Step 3: Cross multiply
    721.25x = 994.87 × 426.31
  4. Step 4: Simplify right side
    721.25x = 424,115.92
  5. Step 5: Solve for x
    x = 424,115.92/721.25
  6. Step 6: Final answer
    x = 588.03

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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.