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Finding the Fourth Proportional to 318.49, 439.18 and 248.42

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Solution

The fourth proportional to 318.49, 439.18 and 248.42 is: 342.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.49 : 439.18 = 248.42 : x
  2. Step 2: Convert to fraction form
    318.49/439.18 = 248.42/x
  3. Step 3: Cross multiply
    318.49x = 439.18 × 248.42
  4. Step 4: Simplify right side
    318.49x = 109,101.57
  5. Step 5: Solve for x
    x = 109,101.57/318.49
  6. Step 6: Final answer
    x = 342.56

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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.