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Finding the Fourth Proportional to 198.50, 273.96 and 120.86

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Solution

The fourth proportional to 198.50, 273.96 and 120.86 is: 166.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.50 : 273.96 = 120.86 : x
  2. Step 2: Convert to fraction form
    198.50/273.96 = 120.86/x
  3. Step 3: Cross multiply
    198.50x = 273.96 × 120.86
  4. Step 4: Simplify right side
    198.50x = 33,110.81
  5. Step 5: Solve for x
    x = 33,110.81/198.50
  6. Step 6: Final answer
    x = 166.81

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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.