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Finding the Fourth Proportional to 204.13, 281.82 and 138.64

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Solution

The fourth proportional to 204.13, 281.82 and 138.64 is: 191.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.13 : 281.82 = 138.64 : x
  2. Step 2: Convert to fraction form
    204.13/281.82 = 138.64/x
  3. Step 3: Cross multiply
    204.13x = 281.82 × 138.64
  4. Step 4: Simplify right side
    204.13x = 39,071.52
  5. Step 5: Solve for x
    x = 39,071.52/204.13
  6. Step 6: Final answer
    x = 191.41

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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.