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Finding the Fourth Proportional to 99.17, 148.79 and 81.89

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Solution

The fourth proportional to 99.17, 148.79 and 81.89 is: 122.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.17 : 148.79 = 81.89 : x
  2. Step 2: Convert to fraction form
    99.17/148.79 = 81.89/x
  3. Step 3: Cross multiply
    99.17x = 148.79 × 81.89
  4. Step 4: Simplify right side
    99.17x = 12,183.55
  5. Step 5: Solve for x
    x = 12,183.55/99.17
  6. Step 6: Final answer
    x = 122.85

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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.