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Finding the Fourth Proportional to 198.97, 274.60 and 111.67

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Solution

The fourth proportional to 198.97, 274.60 and 111.67 is: 154.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.97 : 274.60 = 111.67 : x
  2. Step 2: Convert to fraction form
    198.97/274.60 = 111.67/x
  3. Step 3: Cross multiply
    198.97x = 274.60 × 111.67
  4. Step 4: Simplify right side
    198.97x = 30,664.02
  5. Step 5: Solve for x
    x = 30,664.02/198.97
  6. Step 6: Final answer
    x = 154.11

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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.