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Finding the Fourth Proportional to 318.17, 439.08 and 185.42

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Solution

The fourth proportional to 318.17, 439.08 and 185.42 is: 255.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.17 : 439.08 = 185.42 : x
  2. Step 2: Convert to fraction form
    318.17/439.08 = 185.42/x
  3. Step 3: Cross multiply
    318.17x = 439.08 × 185.42
  4. Step 4: Simplify right side
    318.17x = 81,414.62
  5. Step 5: Solve for x
    x = 81,414.62/318.17
  6. Step 6: Final answer
    x = 255.88

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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.