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Finding the Fourth Proportional to 31.92, 43.92 and 28.26

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Solution

The fourth proportional to 31.92, 43.92 and 28.26 is: 38.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.92 : 43.92 = 28.26 : x
  2. Step 2: Convert to fraction form
    31.92/43.92 = 28.26/x
  3. Step 3: Cross multiply
    31.92x = 43.92 × 28.26
  4. Step 4: Simplify right side
    31.92x = 1,241.18
  5. Step 5: Solve for x
    x = 1,241.18/31.92
  6. Step 6: Final answer
    x = 38.88

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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.