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Finding the Fourth Proportional to 198.87, 274.46 and 149.66

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Solution

The fourth proportional to 198.87, 274.46 and 149.66 is: 206.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.87 : 274.46 = 149.66 : x
  2. Step 2: Convert to fraction form
    198.87/274.46 = 149.66/x
  3. Step 3: Cross multiply
    198.87x = 274.46 × 149.66
  4. Step 4: Simplify right side
    198.87x = 41,076.14
  5. Step 5: Solve for x
    x = 41,076.14/198.87
  6. Step 6: Final answer
    x = 206.55

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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.