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Finding the Fourth Proportional to 203.77, 281.15 and 138.27

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Solution

The fourth proportional to 203.77, 281.15 and 138.27 is: 190.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.77 : 281.15 = 138.27 : x
  2. Step 2: Convert to fraction form
    203.77/281.15 = 138.27/x
  3. Step 3: Cross multiply
    203.77x = 281.15 × 138.27
  4. Step 4: Simplify right side
    203.77x = 38,874.61
  5. Step 5: Solve for x
    x = 38,874.61/203.77
  6. Step 6: Final answer
    x = 190.78

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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.