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Finding the Fourth Proportional to 28.18, 39.14 and 27.91

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Solution

The fourth proportional to 28.18, 39.14 and 27.91 is: 38.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.18 : 39.14 = 27.91 : x
  2. Step 2: Convert to fraction form
    28.18/39.14 = 27.91/x
  3. Step 3: Cross multiply
    28.18x = 39.14 × 27.91
  4. Step 4: Simplify right side
    28.18x = 1,092.40
  5. Step 5: Solve for x
    x = 1,092.40/28.18
  6. Step 6: Final answer
    x = 38.76

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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.