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Finding the Fourth Proportional to 379.47, 523.65 and 213.69

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Solution

The fourth proportional to 379.47, 523.65 and 213.69 is: 294.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.47 : 523.65 = 213.69 : x
  2. Step 2: Convert to fraction form
    379.47/523.65 = 213.69/x
  3. Step 3: Cross multiply
    379.47x = 523.65 × 213.69
  4. Step 4: Simplify right side
    379.47x = 111,898.77
  5. Step 5: Solve for x
    x = 111,898.77/379.47
  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.