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Finding the Fourth Proportional to 225.85, 338.79 and 81.47

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Solution

The fourth proportional to 225.85, 338.79 and 81.47 is: 122.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.85 : 338.79 = 81.47 : x
  2. Step 2: Convert to fraction form
    225.85/338.79 = 81.47/x
  3. Step 3: Cross multiply
    225.85x = 338.79 × 81.47
  4. Step 4: Simplify right side
    225.85x = 27,601.22
  5. Step 5: Solve for x
    x = 27,601.22/225.85
  6. Step 6: Final answer
    x = 122.21

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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.