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Finding the Fourth Proportional to 8.38, 12.57 and 3.31

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Solution

The fourth proportional to 8.38, 12.57 and 3.31 is: 4.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.38 : 12.57 = 3.31 : x
  2. Step 2: Convert to fraction form
    8.38/12.57 = 3.31/x
  3. Step 3: Cross multiply
    8.38x = 12.57 × 3.31
  4. Step 4: Simplify right side
    8.38x = 41.56
  5. Step 5: Solve for x
    x = 41.56/8.38
  6. Step 6: Final answer
    x = 4.96

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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.