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Finding the Fourth Proportional to 311.96, 467.91 and 80.85

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Solution

The fourth proportional to 311.96, 467.91 and 80.85 is: 121.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.96 : 467.91 = 80.85 : x
  2. Step 2: Convert to fraction form
    311.96/467.91 = 80.85/x
  3. Step 3: Cross multiply
    311.96x = 467.91 × 80.85
  4. Step 4: Simplify right side
    311.96x = 37,830.52
  5. Step 5: Solve for x
    x = 37,830.52/311.96
  6. Step 6: Final answer
    x = 121.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.