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Finding the Fourth Proportional to 198.84, 274.42 and 111.54

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Solution

The fourth proportional to 198.84, 274.42 and 111.54 is: 153.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.84 : 274.42 = 111.54 : x
  2. Step 2: Convert to fraction form
    198.84/274.42 = 111.54/x
  3. Step 3: Cross multiply
    198.84x = 274.42 × 111.54
  4. Step 4: Simplify right side
    198.84x = 30,608.81
  5. Step 5: Solve for x
    x = 30,608.81/198.84
  6. Step 6: Final answer
    x = 153.94

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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.