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Finding the Fourth Proportional to 281.67, 388.08 and 198.65

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Solution

The fourth proportional to 281.67, 388.08 and 198.65 is: 273.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.67 : 388.08 = 198.65 : x
  2. Step 2: Convert to fraction form
    281.67/388.08 = 198.65/x
  3. Step 3: Cross multiply
    281.67x = 388.08 × 198.65
  4. Step 4: Simplify right side
    281.67x = 77,090.15
  5. Step 5: Solve for x
    x = 77,090.15/281.67
  6. Step 6: Final answer
    x = 273.69

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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.