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Finding the Fourth Proportional to 225.89, 311.72 and 122.39

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Solution

The fourth proportional to 225.89, 311.72 and 122.39 is: 168.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.89 : 311.72 = 122.39 : x
  2. Step 2: Convert to fraction form
    225.89/311.72 = 122.39/x
  3. Step 3: Cross multiply
    225.89x = 311.72 × 122.39
  4. Step 4: Simplify right side
    225.89x = 38,149.55
  5. Step 5: Solve for x
    x = 38,149.55/225.89
  6. Step 6: Final answer
    x = 168.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.