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Finding the Fourth Proportional to 198.09, 273.20 and 128.16

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Solution

The fourth proportional to 198.09, 273.20 and 128.16 is: 176.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.09 : 273.20 = 128.16 : x
  2. Step 2: Convert to fraction form
    198.09/273.20 = 128.16/x
  3. Step 3: Cross multiply
    198.09x = 273.20 × 128.16
  4. Step 4: Simplify right side
    198.09x = 35,012.67
  5. Step 5: Solve for x
    x = 35,012.67/198.09
  6. Step 6: Final answer
    x = 176.75

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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.