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Finding the Fourth Proportional to 198.95, 298.84 and 121.95

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Solution

The fourth proportional to 198.95, 298.84 and 121.95 is: 183.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.95 : 298.84 = 121.95 : x
  2. Step 2: Convert to fraction form
    198.95/298.84 = 121.95/x
  3. Step 3: Cross multiply
    198.95x = 298.84 × 121.95
  4. Step 4: Simplify right side
    198.95x = 36,443.54
  5. Step 5: Solve for x
    x = 36,443.54/198.95
  6. Step 6: Final answer
    x = 183.18

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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.