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Finding the Fourth Proportional to 95.31, 142.27 and 81.87

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Solution

The fourth proportional to 95.31, 142.27 and 81.87 is: 122.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.31 : 142.27 = 81.87 : x
  2. Step 2: Convert to fraction form
    95.31/142.27 = 81.87/x
  3. Step 3: Cross multiply
    95.31x = 142.27 × 81.87
  4. Step 4: Simplify right side
    95.31x = 11,647.64
  5. Step 5: Solve for x
    x = 11,647.64/95.31
  6. Step 6: Final answer
    x = 122.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.