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Finding the Fourth Proportional to 318.82, 477.30 and 272.56

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Solution

The fourth proportional to 318.82, 477.30 and 272.56 is: 408.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.82 : 477.30 = 272.56 : x
  2. Step 2: Convert to fraction form
    318.82/477.30 = 272.56/x
  3. Step 3: Cross multiply
    318.82x = 477.30 × 272.56
  4. Step 4: Simplify right side
    318.82x = 130,092.89
  5. Step 5: Solve for x
    x = 130,092.89/318.82
  6. Step 6: Final answer
    x = 408.04

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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.