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Finding the Fourth Proportional to 95.21, 142.17 and 81.53

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Solution

The fourth proportional to 95.21, 142.17 and 81.53 is: 121.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.21 : 142.17 = 81.53 : x
  2. Step 2: Convert to fraction form
    95.21/142.17 = 81.53/x
  3. Step 3: Cross multiply
    95.21x = 142.17 × 81.53
  4. Step 4: Simplify right side
    95.21x = 11,590.41
  5. Step 5: Solve for x
    x = 11,590.41/95.21
  6. Step 6: Final answer
    x = 121.74

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