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Finding the Fourth Proportional to 204.18, 281.64 and 138.70

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Solution

The fourth proportional to 204.18, 281.64 and 138.70 is: 191.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.18 : 281.64 = 138.70 : x
  2. Step 2: Convert to fraction form
    204.18/281.64 = 138.70/x
  3. Step 3: Cross multiply
    204.18x = 281.64 × 138.70
  4. Step 4: Simplify right side
    204.18x = 39,063.47
  5. Step 5: Solve for x
    x = 39,063.47/204.18
  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.