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Finding the Fourth Proportional to 721.21, 994.90 and 425.97

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Solution

The fourth proportional to 721.21, 994.90 and 425.97 is: 587.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.21 : 994.90 = 425.97 : x
  2. Step 2: Convert to fraction form
    721.21/994.90 = 425.97/x
  3. Step 3: Cross multiply
    721.21x = 994.90 × 425.97
  4. Step 4: Simplify right side
    721.21x = 423,790.45
  5. Step 5: Solve for x
    x = 423,790.45/721.21
  6. Step 6: Final answer
    x = 587.61

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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.