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Finding the Fourth Proportional to 379.21, 523.29 and 213.41

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Solution

The fourth proportional to 379.21, 523.29 and 213.41 is: 294.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.21 : 523.29 = 213.41 : x
  2. Step 2: Convert to fraction form
    379.21/523.29 = 213.41/x
  3. Step 3: Cross multiply
    379.21x = 523.29 × 213.41
  4. Step 4: Simplify right side
    379.21x = 111,672.70
  5. Step 5: Solve for x
    x = 111,672.70/379.21
  6. Step 6: Final answer
    x = 294.49

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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.