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Finding the Fourth Proportional to 132.19, 198.06 and 86.38

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Solution

The fourth proportional to 132.19, 198.06 and 86.38 is: 129.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.19 : 198.06 = 86.38 : x
  2. Step 2: Convert to fraction form
    132.19/198.06 = 86.38/x
  3. Step 3: Cross multiply
    132.19x = 198.06 × 86.38
  4. Step 4: Simplify right side
    132.19x = 17,108.42
  5. Step 5: Solve for x
    x = 17,108.42/132.19
  6. Step 6: Final answer
    x = 129.42

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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.