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Finding the Fourth Proportional to 132, 197.55 and 86.28

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Solution

The fourth proportional to 132, 197.55 and 86.28 is: 129.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    132 : 197.55 = 86.28 : x
  2. Step 2: Convert to fraction form
    132/197.55 = 86.28/x
  3. Step 3: Cross multiply
    132x = 197.55 × 86.28
  4. Step 4: Simplify right side
    132x = 17,044.61
  5. Step 5: Solve for x
    x = 17,044.61/132
  6. Step 6: Final answer
    x = 129.13

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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.