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Finding the Fourth Proportional to 379.11, 523.22 and 221.76

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Solution

The fourth proportional to 379.11, 523.22 and 221.76 is: 306.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.11 : 523.22 = 221.76 : x
  2. Step 2: Convert to fraction form
    379.11/523.22 = 221.76/x
  3. Step 3: Cross multiply
    379.11x = 523.22 × 221.76
  4. Step 4: Simplify right side
    379.11x = 116,029.27
  5. Step 5: Solve for x
    x = 116,029.27/379.11
  6. Step 6: Final answer
    x = 306.06

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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.