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Finding the Fourth Proportional to 28, 38.90 and 27.74

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Solution

The fourth proportional to 28, 38.90 and 27.74 is: 38.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    28 : 38.90 = 27.74 : x
  2. Step 2: Convert to fraction form
    28/38.90 = 27.74/x
  3. Step 3: Cross multiply
    28x = 38.90 × 27.74
  4. Step 4: Simplify right side
    28x = 1,079.09
  5. Step 5: Solve for x
    x = 1,079.09/28
  6. Step 6: Final answer
    x = 38.54

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.