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Finding the Fourth Proportional to 318.48, 439.56 and 249.36

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Solution

The fourth proportional to 318.48, 439.56 and 249.36 is: 344.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.48 : 439.56 = 249.36 : x
  2. Step 2: Convert to fraction form
    318.48/439.56 = 249.36/x
  3. Step 3: Cross multiply
    318.48x = 439.56 × 249.36
  4. Step 4: Simplify right side
    318.48x = 109,608.68
  5. Step 5: Solve for x
    x = 109,608.68/318.48
  6. Step 6: Final answer
    x = 344.16

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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.