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Finding the Fourth Proportional to 318.32, 439.26 and 178.43

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Solution

The fourth proportional to 318.32, 439.26 and 178.43 is: 246.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.32 : 439.26 = 178.43 : x
  2. Step 2: Convert to fraction form
    318.32/439.26 = 178.43/x
  3. Step 3: Cross multiply
    318.32x = 439.26 × 178.43
  4. Step 4: Simplify right side
    318.32x = 78,374.97
  5. Step 5: Solve for x
    x = 78,374.97/318.32
  6. Step 6: Final answer
    x = 246.22

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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.