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Finding the Fourth Proportional to 311.84, 467.72 and 80.73

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Solution

The fourth proportional to 311.84, 467.72 and 80.73 is: 121.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.84 : 467.72 = 80.73 : x
  2. Step 2: Convert to fraction form
    311.84/467.72 = 80.73/x
  3. Step 3: Cross multiply
    311.84x = 467.72 × 80.73
  4. Step 4: Simplify right side
    311.84x = 37,758.71
  5. Step 5: Solve for x
    x = 37,758.71/311.84
  6. Step 6: Final answer
    x = 121.08

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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.