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Finding the Fourth Proportional to 81.99, 122.88 and 57.96

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Solution

The fourth proportional to 81.99, 122.88 and 57.96 is: 86.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.99 : 122.88 = 57.96 : x
  2. Step 2: Convert to fraction form
    81.99/122.88 = 57.96/x
  3. Step 3: Cross multiply
    81.99x = 122.88 × 57.96
  4. Step 4: Simplify right side
    81.99x = 7,122.12
  5. Step 5: Solve for x
    x = 7,122.12/81.99
  6. Step 6: Final answer
    x = 86.87

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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.