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Finding the Fourth Proportional to 27.87, 38.41 and 20.94

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Solution

The fourth proportional to 27.87, 38.41 and 20.94 is: 28.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.87 : 38.41 = 20.94 : x
  2. Step 2: Convert to fraction form
    27.87/38.41 = 20.94/x
  3. Step 3: Cross multiply
    27.87x = 38.41 × 20.94
  4. Step 4: Simplify right side
    27.87x = 804.31
  5. Step 5: Solve for x
    x = 804.31/27.87
  6. Step 6: Final answer
    x = 28.86

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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.