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Finding the Fourth Proportional to 198.51, 273.78 and 128.44

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Solution

The fourth proportional to 198.51, 273.78 and 128.44 is: 177.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.51 : 273.78 = 128.44 : x
  2. Step 2: Convert to fraction form
    198.51/273.78 = 128.44/x
  3. Step 3: Cross multiply
    198.51x = 273.78 × 128.44
  4. Step 4: Simplify right side
    198.51x = 35,164.30
  5. Step 5: Solve for x
    x = 35,164.30/198.51
  6. Step 6: Final answer
    x = 177.14

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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.