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Finding the Fourth Proportional to 198.53, 298.31 and 186.87

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Solution

The fourth proportional to 198.53, 298.31 and 186.87 is: 280.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.53 : 298.31 = 186.87 : x
  2. Step 2: Convert to fraction form
    198.53/298.31 = 186.87/x
  3. Step 3: Cross multiply
    198.53x = 298.31 × 186.87
  4. Step 4: Simplify right side
    198.53x = 55,745.19
  5. Step 5: Solve for x
    x = 55,745.19/198.53
  6. Step 6: Final answer
    x = 280.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.