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Finding the Fourth Proportional to 198.91, 274.50 and 111.61

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Solution

The fourth proportional to 198.91, 274.50 and 111.61 is: 154.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.91 : 274.50 = 111.61 : x
  2. Step 2: Convert to fraction form
    198.91/274.50 = 111.61/x
  3. Step 3: Cross multiply
    198.91x = 274.50 × 111.61
  4. Step 4: Simplify right side
    198.91x = 30,636.95
  5. Step 5: Solve for x
    x = 30,636.95/198.91
  6. Step 6: Final answer
    x = 154.02

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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.