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Finding the Fourth Proportional to 31.29, 43.07 and 27.92

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Solution

The fourth proportional to 31.29, 43.07 and 27.92 is: 38.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.29 : 43.07 = 27.92 : x
  2. Step 2: Convert to fraction form
    31.29/43.07 = 27.92/x
  3. Step 3: Cross multiply
    31.29x = 43.07 × 27.92
  4. Step 4: Simplify right side
    31.29x = 1,202.16
  5. Step 5: Solve for x
    x = 1,202.16/31.29
  6. Step 6: Final answer
    x = 38.42

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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.