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Finding the Fourth Proportional to 204.31, 281.84 and 138.84

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Solution

The fourth proportional to 204.31, 281.84 and 138.84 is: 191.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.31 : 281.84 = 138.84 : x
  2. Step 2: Convert to fraction form
    204.31/281.84 = 138.84/x
  3. Step 3: Cross multiply
    204.31x = 281.84 × 138.84
  4. Step 4: Simplify right side
    204.31x = 39,130.67
  5. Step 5: Solve for x
    x = 39,130.67/204.31
  6. Step 6: Final answer
    x = 191.53

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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.