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Finding the Fourth Proportional to 225.78, 338.69 and 71.72

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Solution

The fourth proportional to 225.78, 338.69 and 71.72 is: 107.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.78 : 338.69 = 71.72 : x
  2. Step 2: Convert to fraction form
    225.78/338.69 = 71.72/x
  3. Step 3: Cross multiply
    225.78x = 338.69 × 71.72
  4. Step 4: Simplify right side
    225.78x = 24,290.85
  5. Step 5: Solve for x
    x = 24,290.85/225.78
  6. Step 6: Final answer
    x = 107.59

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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.