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Finding the Fourth Proportional to 27.71, 38.26 and 20.42

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Solution

The fourth proportional to 27.71, 38.26 and 20.42 is: 28.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.71 : 38.26 = 20.42 : x
  2. Step 2: Convert to fraction form
    27.71/38.26 = 20.42/x
  3. Step 3: Cross multiply
    27.71x = 38.26 × 20.42
  4. Step 4: Simplify right side
    27.71x = 781.25
  5. Step 5: Solve for x
    x = 781.25/27.71
  6. Step 6: Final answer
    x = 28.19

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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.