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Finding the Fourth Proportional to 95.31, 142.76 and 81.44

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Solution

The fourth proportional to 95.31, 142.76 and 81.44 is: 121.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.31 : 142.76 = 81.44 : x
  2. Step 2: Convert to fraction form
    95.31/142.76 = 81.44/x
  3. Step 3: Cross multiply
    95.31x = 142.76 × 81.44
  4. Step 4: Simplify right side
    95.31x = 11,625.86
  5. Step 5: Solve for x
    x = 11,625.86/95.31
  6. Step 6: Final answer
    x = 121.98

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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.