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Finding the Fourth Proportional to 198.45, 273.70 and 128.51

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Solution

The fourth proportional to 198.45, 273.70 and 128.51 is: 177.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.45 : 273.70 = 128.51 : x
  2. Step 2: Convert to fraction form
    198.45/273.70 = 128.51/x
  3. Step 3: Cross multiply
    198.45x = 273.70 × 128.51
  4. Step 4: Simplify right side
    198.45x = 35,173.19
  5. Step 5: Solve for x
    x = 35,173.19/198.45
  6. Step 6: Final answer
    x = 177.24

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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.