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Finding the Fourth Proportional to 95.55, 131.72 and 81.88

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Solution

The fourth proportional to 95.55, 131.72 and 81.88 is: 112.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.55 : 131.72 = 81.88 : x
  2. Step 2: Convert to fraction form
    95.55/131.72 = 81.88/x
  3. Step 3: Cross multiply
    95.55x = 131.72 × 81.88
  4. Step 4: Simplify right side
    95.55x = 10,785.11
  5. Step 5: Solve for x
    x = 10,785.11/95.55
  6. Step 6: Final answer
    x = 112.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.