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Finding the Fourth Proportional to 281.54, 388.41 and 198.48

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Solution

The fourth proportional to 281.54, 388.41 and 198.48 is: 273.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.54 : 388.41 = 198.48 : x
  2. Step 2: Convert to fraction form
    281.54/388.41 = 198.48/x
  3. Step 3: Cross multiply
    281.54x = 388.41 × 198.48
  4. Step 4: Simplify right side
    281.54x = 77,091.62
  5. Step 5: Solve for x
    x = 77,091.62/281.54
  6. Step 6: Final answer
    x = 273.82

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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.