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Finding the Fourth Proportional to 381.44, 571.16 and 311.76

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Solution

The fourth proportional to 381.44, 571.16 and 311.76 is: 466.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.44 : 571.16 = 311.76 : x
  2. Step 2: Convert to fraction form
    381.44/571.16 = 311.76/x
  3. Step 3: Cross multiply
    381.44x = 571.16 × 311.76
  4. Step 4: Simplify right side
    381.44x = 178,064.84
  5. Step 5: Solve for x
    x = 178,064.84/381.44
  6. Step 6: Final answer
    x = 466.82

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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.