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Finding the Fourth Proportional to 132.72, 198.13 and 128.22

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Solution

The fourth proportional to 132.72, 198.13 and 128.22 is: 191.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.72 : 198.13 = 128.22 : x
  2. Step 2: Convert to fraction form
    132.72/198.13 = 128.22/x
  3. Step 3: Cross multiply
    132.72x = 198.13 × 128.22
  4. Step 4: Simplify right side
    132.72x = 25,404.23
  5. Step 5: Solve for x
    x = 25,404.23/132.72
  6. Step 6: Final answer
    x = 191.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.