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Finding the Fourth Proportional to 81.73, 122.18 and 57.70

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Solution

The fourth proportional to 81.73, 122.18 and 57.70 is: 86.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.73 : 122.18 = 57.70 : x
  2. Step 2: Convert to fraction form
    81.73/122.18 = 57.70/x
  3. Step 3: Cross multiply
    81.73x = 122.18 × 57.70
  4. Step 4: Simplify right side
    81.73x = 7,049.79
  5. Step 5: Solve for x
    x = 7,049.79/81.73
  6. Step 6: Final answer
    x = 86.26

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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.