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Finding the Fourth Proportional to 281.87, 388.98 and 199.12

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Solution

The fourth proportional to 281.87, 388.98 and 199.12 is: 274.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.87 : 388.98 = 199.12 : x
  2. Step 2: Convert to fraction form
    281.87/388.98 = 199.12/x
  3. Step 3: Cross multiply
    281.87x = 388.98 × 199.12
  4. Step 4: Simplify right side
    281.87x = 77,452.73
  5. Step 5: Solve for x
    x = 77,452.73/281.87
  6. Step 6: Final answer
    x = 274.79

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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.