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Finding the Fourth Proportional to 381.38, 571.79 and 271.69

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Solution

The fourth proportional to 381.38, 571.79 and 271.69 is: 407.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.38 : 571.79 = 271.69 : x
  2. Step 2: Convert to fraction form
    381.38/571.79 = 271.69/x
  3. Step 3: Cross multiply
    381.38x = 571.79 × 271.69
  4. Step 4: Simplify right side
    381.38x = 155,348.87
  5. Step 5: Solve for x
    x = 155,348.87/381.38
  6. Step 6: Final answer
    x = 407.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.