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Finding the Fourth Proportional to 198.62, 274.16 and 115.76

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Solution

The fourth proportional to 198.62, 274.16 and 115.76 is: 159.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.62 : 274.16 = 115.76 : x
  2. Step 2: Convert to fraction form
    198.62/274.16 = 115.76/x
  3. Step 3: Cross multiply
    198.62x = 274.16 × 115.76
  4. Step 4: Simplify right side
    198.62x = 31,736.76
  5. Step 5: Solve for x
    x = 31,736.76/198.62
  6. Step 6: Final answer
    x = 159.79

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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.