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Finding the Fourth Proportional to 132.74, 199.25 and 81.40

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Solution

The fourth proportional to 132.74, 199.25 and 81.40 is: 122.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.74 : 199.25 = 81.40 : x
  2. Step 2: Convert to fraction form
    132.74/199.25 = 81.40/x
  3. Step 3: Cross multiply
    132.74x = 199.25 × 81.40
  4. Step 4: Simplify right side
    132.74x = 16,217.55
  5. Step 5: Solve for x
    x = 16,217.55/132.74
  6. Step 6: Final answer
    x = 122.18

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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.