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Finding the Fourth Proportional to 204.21, 281.70 and 138.69

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Solution

The fourth proportional to 204.21, 281.70 and 138.69 is: 191.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.21 : 281.70 = 138.69 : x
  2. Step 2: Convert to fraction form
    204.21/281.70 = 138.69/x
  3. Step 3: Cross multiply
    204.21x = 281.70 × 138.69
  4. Step 4: Simplify right side
    204.21x = 39,068.97
  5. Step 5: Solve for x
    x = 39,068.97/204.21
  6. Step 6: Final answer
    x = 191.32

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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.