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Finding the Fourth Proportional to 132.36, 198.95 and 81.11

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Solution

The fourth proportional to 132.36, 198.95 and 81.11 is: 121.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.36 : 198.95 = 81.11 : x
  2. Step 2: Convert to fraction form
    132.36/198.95 = 81.11/x
  3. Step 3: Cross multiply
    132.36x = 198.95 × 81.11
  4. Step 4: Simplify right side
    132.36x = 16,135.43
  5. Step 5: Solve for x
    x = 16,135.43/132.36
  6. Step 6: Final answer
    x = 121.91

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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.