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Finding the Fourth Proportional to 38.35, 57.78 and 31.73

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Solution

The fourth proportional to 38.35, 57.78 and 31.73 is: 47.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.35 : 57.78 = 31.73 : x
  2. Step 2: Convert to fraction form
    38.35/57.78 = 31.73/x
  3. Step 3: Cross multiply
    38.35x = 57.78 × 31.73
  4. Step 4: Simplify right side
    38.35x = 1,833.20
  5. Step 5: Solve for x
    x = 1,833.20/38.35
  6. Step 6: Final answer
    x = 47.81

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.