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Finding the Fourth Proportional to 203.88, 281.28 and 138.28

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Solution

The fourth proportional to 203.88, 281.28 and 138.28 is: 190.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.88 : 281.28 = 138.28 : x
  2. Step 2: Convert to fraction form
    203.88/281.28 = 138.28/x
  3. Step 3: Cross multiply
    203.88x = 281.28 × 138.28
  4. Step 4: Simplify right side
    203.88x = 38,895.40
  5. Step 5: Solve for x
    x = 38,895.40/203.88
  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.