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Finding the Fourth Proportional to 318.80, 439.91 and 178.90

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Solution

The fourth proportional to 318.80, 439.91 and 178.90 is: 246.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.80 : 439.91 = 178.90 : x
  2. Step 2: Convert to fraction form
    318.80/439.91 = 178.90/x
  3. Step 3: Cross multiply
    318.80x = 439.91 × 178.90
  4. Step 4: Simplify right side
    318.80x = 78,697.70
  5. Step 5: Solve for x
    x = 78,697.70/318.80
  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.