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Finding the Fourth Proportional to 198.95, 299.78 and 163.67

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Solution

The fourth proportional to 198.95, 299.78 and 163.67 is: 246.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.95 : 299.78 = 163.67 : x
  2. Step 2: Convert to fraction form
    198.95/299.78 = 163.67/x
  3. Step 3: Cross multiply
    198.95x = 299.78 × 163.67
  4. Step 4: Simplify right side
    198.95x = 49,064.99
  5. Step 5: Solve for x
    x = 49,064.99/198.95
  6. Step 6: Final answer
    x = 246.62

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.