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Finding the Fourth Proportional to 198.36, 273.71 and 111.03

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Solution

The fourth proportional to 198.36, 273.71 and 111.03 is: 153.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.36 : 273.71 = 111.03 : x
  2. Step 2: Convert to fraction form
    198.36/273.71 = 111.03/x
  3. Step 3: Cross multiply
    198.36x = 273.71 × 111.03
  4. Step 4: Simplify right side
    198.36x = 30,390.02
  5. Step 5: Solve for x
    x = 30,390.02/198.36
  6. Step 6: Final answer
    x = 153.21

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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.