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Finding the Fourth Proportional to 204.31, 281.94 and 121.39

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Solution

The fourth proportional to 204.31, 281.94 and 121.39 is: 167.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.31 : 281.94 = 121.39 : x
  2. Step 2: Convert to fraction form
    204.31/281.94 = 121.39/x
  3. Step 3: Cross multiply
    204.31x = 281.94 × 121.39
  4. Step 4: Simplify right side
    204.31x = 34,224.70
  5. Step 5: Solve for x
    x = 34,224.70/204.31
  6. Step 6: Final answer
    x = 167.51

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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.