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Finding the Fourth Proportional to 574.30, 861.54 and 281.80

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Solution

The fourth proportional to 574.30, 861.54 and 281.80 is: 422.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.30 : 861.54 = 281.80 : x
  2. Step 2: Convert to fraction form
    574.30/861.54 = 281.80/x
  3. Step 3: Cross multiply
    574.30x = 861.54 × 281.80
  4. Step 4: Simplify right side
    574.30x = 242,781.97
  5. Step 5: Solve for x
    x = 242,781.97/574.30
  6. Step 6: Final answer
    x = 422.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.