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Finding the Fourth Proportional to 318.97, 440.19 and 249.11

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Solution

The fourth proportional to 318.97, 440.19 and 249.11 is: 343.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.97 : 440.19 = 249.11 : x
  2. Step 2: Convert to fraction form
    318.97/440.19 = 249.11/x
  3. Step 3: Cross multiply
    318.97x = 440.19 × 249.11
  4. Step 4: Simplify right side
    318.97x = 109,654.49
  5. Step 5: Solve for x
    x = 109,654.49/318.97
  6. Step 6: Final answer
    x = 343.78

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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.