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Finding the Fourth Proportional to 132.23, 198.28 and 86.81

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Solution

The fourth proportional to 132.23, 198.28 and 86.81 is: 130.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.23 : 198.28 = 86.81 : x
  2. Step 2: Convert to fraction form
    132.23/198.28 = 86.81/x
  3. Step 3: Cross multiply
    132.23x = 198.28 × 86.81
  4. Step 4: Simplify right side
    132.23x = 17,212.97
  5. Step 5: Solve for x
    x = 17,212.97/132.23
  6. Step 6: Final answer
    x = 130.18

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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.