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Finding the Fourth Proportional to 95.15, 131.31 and 81.29

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Solution

The fourth proportional to 95.15, 131.31 and 81.29 is: 112.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.15 : 131.31 = 81.29 : x
  2. Step 2: Convert to fraction form
    95.15/131.31 = 81.29/x
  3. Step 3: Cross multiply
    95.15x = 131.31 × 81.29
  4. Step 4: Simplify right side
    95.15x = 10,673.53
  5. Step 5: Solve for x
    x = 10,673.53/95.15
  6. Step 6: Final answer
    x = 112.18

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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.