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Finding the Fourth Proportional to 198.55, 274.03 and 115.65

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Solution

The fourth proportional to 198.55, 274.03 and 115.65 is: 159.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.55 : 274.03 = 115.65 : x
  2. Step 2: Convert to fraction form
    198.55/274.03 = 115.65/x
  3. Step 3: Cross multiply
    198.55x = 274.03 × 115.65
  4. Step 4: Simplify right side
    198.55x = 31,691.71
  5. Step 5: Solve for x
    x = 31,691.71/198.55
  6. Step 6: Final answer
    x = 159.62

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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.