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Finding the Fourth Proportional to 198.50, 273.80 and 128.54

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Solution

The fourth proportional to 198.50, 273.80 and 128.54 is: 177.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.50 : 273.80 = 128.54 : x
  2. Step 2: Convert to fraction form
    198.50/273.80 = 128.54/x
  3. Step 3: Cross multiply
    198.50x = 273.80 × 128.54
  4. Step 4: Simplify right side
    198.50x = 35,194.25
  5. Step 5: Solve for x
    x = 35,194.25/198.50
  6. Step 6: Final answer
    x = 177.30

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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.