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Finding the Fourth Proportional to 132.56, 198.90 and 71.72

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Solution

The fourth proportional to 132.56, 198.90 and 71.72 is: 107.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.56 : 198.90 = 71.72 : x
  2. Step 2: Convert to fraction form
    132.56/198.90 = 71.72/x
  3. Step 3: Cross multiply
    132.56x = 198.90 × 71.72
  4. Step 4: Simplify right side
    132.56x = 14,265.11
  5. Step 5: Solve for x
    x = 14,265.11/132.56
  6. Step 6: Final answer
    x = 107.61

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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.