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Finding the Fourth Proportional to 379.65, 523.90 and 213.87

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Solution

The fourth proportional to 379.65, 523.90 and 213.87 is: 295.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.65 : 523.90 = 213.87 : x
  2. Step 2: Convert to fraction form
    379.65/523.90 = 213.87/x
  3. Step 3: Cross multiply
    379.65x = 523.90 × 213.87
  4. Step 4: Simplify right side
    379.65x = 112,046.49
  5. Step 5: Solve for x
    x = 112,046.49/379.65
  6. Step 6: Final answer
    x = 295.13

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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.