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Finding the Fourth Proportional to 198.55, 273.87 and 143.19

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Solution

The fourth proportional to 198.55, 273.87 and 143.19 is: 197.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.55 : 273.87 = 143.19 : x
  2. Step 2: Convert to fraction form
    198.55/273.87 = 143.19/x
  3. Step 3: Cross multiply
    198.55x = 273.87 × 143.19
  4. Step 4: Simplify right side
    198.55x = 39,215.45
  5. Step 5: Solve for x
    x = 39,215.45/198.55
  6. Step 6: Final answer
    x = 197.51

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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.