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Finding the Fourth Proportional to 89.21, 133.41 and 81.92

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Solution

The fourth proportional to 89.21, 133.41 and 81.92 is: 122.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.21 : 133.41 = 81.92 : x
  2. Step 2: Convert to fraction form
    89.21/133.41 = 81.92/x
  3. Step 3: Cross multiply
    89.21x = 133.41 × 81.92
  4. Step 4: Simplify right side
    89.21x = 10,928.95
  5. Step 5: Solve for x
    x = 10,928.95/89.21
  6. Step 6: Final answer
    x = 122.51

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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.