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Finding the Fourth Proportional to 96.21, 144.25 and 81.86

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Solution

The fourth proportional to 96.21, 144.25 and 81.86 is: 122.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.21 : 144.25 = 81.86 : x
  2. Step 2: Convert to fraction form
    96.21/144.25 = 81.86/x
  3. Step 3: Cross multiply
    96.21x = 144.25 × 81.86
  4. Step 4: Simplify right side
    96.21x = 11,808.67
  5. Step 5: Solve for x
    x = 11,808.67/96.21
  6. Step 6: Final answer
    x = 122.74

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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.