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Finding the Fourth Proportional to 133.26, 199.96 and 81.79

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Solution

The fourth proportional to 133.26, 199.96 and 81.79 is: 122.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.26 : 199.96 = 81.79 : x
  2. Step 2: Convert to fraction form
    133.26/199.96 = 81.79/x
  3. Step 3: Cross multiply
    133.26x = 199.96 × 81.79
  4. Step 4: Simplify right side
    133.26x = 16,354.73
  5. Step 5: Solve for x
    x = 16,354.73/133.26
  6. Step 6: Final answer
    x = 122.73

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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.