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Finding the Fourth Proportional to 379.49, 523.69 and 213.68

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Solution

The fourth proportional to 379.49, 523.69 and 213.68 is: 294.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.49 : 523.69 = 213.68 : x
  2. Step 2: Convert to fraction form
    379.49/523.69 = 213.68/x
  3. Step 3: Cross multiply
    379.49x = 523.69 × 213.68
  4. Step 4: Simplify right side
    379.49x = 111,902.85
  5. Step 5: Solve for x
    x = 111,902.85/379.49
  6. Step 6: Final answer
    x = 294.88

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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.