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Finding the Fourth Proportional to 381.17, 571.72 and 134.40

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Solution

The fourth proportional to 381.17, 571.72 and 134.40 is: 201.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.17 : 571.72 = 134.40 : x
  2. Step 2: Convert to fraction form
    381.17/571.72 = 134.40/x
  3. Step 3: Cross multiply
    381.17x = 571.72 × 134.40
  4. Step 4: Simplify right side
    381.17x = 76,839.17
  5. Step 5: Solve for x
    x = 76,839.17/381.17
  6. Step 6: Final answer
    x = 201.59

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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.