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Finding the Fourth Proportional to 132.40, 198.42 and 86.68

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Solution

The fourth proportional to 132.40, 198.42 and 86.68 is: 129.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.40 : 198.42 = 86.68 : x
  2. Step 2: Convert to fraction form
    132.40/198.42 = 86.68/x
  3. Step 3: Cross multiply
    132.40x = 198.42 × 86.68
  4. Step 4: Simplify right side
    132.40x = 17,199.05
  5. Step 5: Solve for x
    x = 17,199.05/132.40
  6. Step 6: Final answer
    x = 129.90

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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.