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Finding the Fourth Proportional to 226.13, 339.19 and 81.86

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Solution

The fourth proportional to 226.13, 339.19 and 81.86 is: 122.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.13 : 339.19 = 81.86 : x
  2. Step 2: Convert to fraction form
    226.13/339.19 = 81.86/x
  3. Step 3: Cross multiply
    226.13x = 339.19 × 81.86
  4. Step 4: Simplify right side
    226.13x = 27,764.19
  5. Step 5: Solve for x
    x = 27,764.19/226.13
  6. Step 6: Final answer
    x = 122.78

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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.