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Finding the Fourth Proportional to 318.54, 439.21 and 271.76

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Solution

The fourth proportional to 318.54, 439.21 and 271.76 is: 374.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.54 : 439.21 = 271.76 : x
  2. Step 2: Convert to fraction form
    318.54/439.21 = 271.76/x
  3. Step 3: Cross multiply
    318.54x = 439.21 × 271.76
  4. Step 4: Simplify right side
    318.54x = 119,361.18
  5. Step 5: Solve for x
    x = 119,361.18/318.54
  6. Step 6: Final answer
    x = 374.71

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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.