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Finding the Fourth Proportional to 198.32, 273.69 and 115.45

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Solution

The fourth proportional to 198.32, 273.69 and 115.45 is: 159.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.32 : 273.69 = 115.45 : x
  2. Step 2: Convert to fraction form
    198.32/273.69 = 115.45/x
  3. Step 3: Cross multiply
    198.32x = 273.69 × 115.45
  4. Step 4: Simplify right side
    198.32x = 31,597.51
  5. Step 5: Solve for x
    x = 31,597.51/198.32
  6. Step 6: Final answer
    x = 159.33

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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.