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Finding the Fourth Proportional to 402.49, 605.13 and 281.26

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Solution

The fourth proportional to 402.49, 605.13 and 281.26 is: 422.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.49 : 605.13 = 281.26 : x
  2. Step 2: Convert to fraction form
    402.49/605.13 = 281.26/x
  3. Step 3: Cross multiply
    402.49x = 605.13 × 281.26
  4. Step 4: Simplify right side
    402.49x = 170,198.86
  5. Step 5: Solve for x
    x = 170,198.86/402.49
  6. Step 6: Final answer
    x = 422.86

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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.