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Finding the Fourth Proportional to 318.51, 440.57 and 249.26

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Solution

The fourth proportional to 318.51, 440.57 and 249.26 is: 344.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.51 : 440.57 = 249.26 : x
  2. Step 2: Convert to fraction form
    318.51/440.57 = 249.26/x
  3. Step 3: Cross multiply
    318.51x = 440.57 × 249.26
  4. Step 4: Simplify right side
    318.51x = 109,814.90
  5. Step 5: Solve for x
    x = 109,814.90/318.51
  6. Step 6: Final answer
    x = 344.78

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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.