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Finding the Fourth Proportional to 132.31, 198.12 and 86.59

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Solution

The fourth proportional to 132.31, 198.12 and 86.59 is: 129.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.31 : 198.12 = 86.59 : x
  2. Step 2: Convert to fraction form
    132.31/198.12 = 86.59/x
  3. Step 3: Cross multiply
    132.31x = 198.12 × 86.59
  4. Step 4: Simplify right side
    132.31x = 17,155.21
  5. Step 5: Solve for x
    x = 17,155.21/132.31
  6. Step 6: Final answer
    x = 129.66

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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.