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Finding the Fourth Proportional to 132.58, 198.80 and 86.95

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Solution

The fourth proportional to 132.58, 198.80 and 86.95 is: 130.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.58 : 198.80 = 86.95 : x
  2. Step 2: Convert to fraction form
    132.58/198.80 = 86.95/x
  3. Step 3: Cross multiply
    132.58x = 198.80 × 86.95
  4. Step 4: Simplify right side
    132.58x = 17,285.66
  5. Step 5: Solve for x
    x = 17,285.66/132.58
  6. Step 6: Final answer
    x = 130.38

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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.