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Finding the Fourth Proportional to 132.68, 198.66 and 121.88

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Solution

The fourth proportional to 132.68, 198.66 and 121.88 is: 182.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.68 : 198.66 = 121.88 : x
  2. Step 2: Convert to fraction form
    132.68/198.66 = 121.88/x
  3. Step 3: Cross multiply
    132.68x = 198.66 × 121.88
  4. Step 4: Simplify right side
    132.68x = 24,212.68
  5. Step 5: Solve for x
    x = 24,212.68/132.68
  6. Step 6: Final answer
    x = 182.49

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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.