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Finding the Fourth Proportional to 381.91, 527.02 and 213.85

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Solution

The fourth proportional to 381.91, 527.02 and 213.85 is: 295.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.91 : 527.02 = 213.85 : x
  2. Step 2: Convert to fraction form
    381.91/527.02 = 213.85/x
  3. Step 3: Cross multiply
    381.91x = 527.02 × 213.85
  4. Step 4: Simplify right side
    381.91x = 112,703.23
  5. Step 5: Solve for x
    x = 112,703.23/381.91
  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.