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Finding the Fourth Proportional to 38.31, 52.82 and 31.39

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Solution

The fourth proportional to 38.31, 52.82 and 31.39 is: 43.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.31 : 52.82 = 31.39 : x
  2. Step 2: Convert to fraction form
    38.31/52.82 = 31.39/x
  3. Step 3: Cross multiply
    38.31x = 52.82 × 31.39
  4. Step 4: Simplify right side
    38.31x = 1,657.85
  5. Step 5: Solve for x
    x = 1,657.85/38.31
  6. Step 6: Final answer
    x = 43.28

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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.