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Finding the Fourth Proportional to 311.72, 467.55 and 80.60

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Solution

The fourth proportional to 311.72, 467.55 and 80.60 is: 120.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.72 : 467.55 = 80.60 : x
  2. Step 2: Convert to fraction form
    311.72/467.55 = 80.60/x
  3. Step 3: Cross multiply
    311.72x = 467.55 × 80.60
  4. Step 4: Simplify right side
    311.72x = 37,684.53
  5. Step 5: Solve for x
    x = 37,684.53/311.72
  6. Step 6: Final answer
    x = 120.89

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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.