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Finding the Fourth Proportional to 318.80, 439.89 and 178.91

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Solution

The fourth proportional to 318.80, 439.89 and 178.91 is: 246.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.80 : 439.89 = 178.91 : x
  2. Step 2: Convert to fraction form
    318.80/439.89 = 178.91/x
  3. Step 3: Cross multiply
    318.80x = 439.89 × 178.91
  4. Step 4: Simplify right side
    318.80x = 78,698.52
  5. Step 5: Solve for x
    x = 78,698.52/318.80
  6. Step 6: Final answer
    x = 246.86

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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.