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Finding the Fourth Proportional to 379.64, 523.89 and 213.85

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Solution

The fourth proportional to 379.64, 523.89 and 213.85 is: 295.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.64 : 523.89 = 213.85 : x
  2. Step 2: Convert to fraction form
    379.64/523.89 = 213.85/x
  3. Step 3: Cross multiply
    379.64x = 523.89 × 213.85
  4. Step 4: Simplify right side
    379.64x = 112,034.53
  5. Step 5: Solve for x
    x = 112,034.53/379.64
  6. Step 6: Final answer
    x = 295.11

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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.