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Finding the Fourth Proportional to 81.89, 122.57 and 57.49

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Solution

The fourth proportional to 81.89, 122.57 and 57.49 is: 86.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.89 : 122.57 = 57.49 : x
  2. Step 2: Convert to fraction form
    81.89/122.57 = 57.49/x
  3. Step 3: Cross multiply
    81.89x = 122.57 × 57.49
  4. Step 4: Simplify right side
    81.89x = 7,045.94
  5. Step 5: Solve for x
    x = 7,045.94/81.89
  6. Step 6: Final answer
    x = 86.04

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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.