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Finding the Fourth Proportional to 281.45, 388.31 and 194.17

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Solution

The fourth proportional to 281.45, 388.31 and 194.17 is: 267.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.45 : 388.31 = 194.17 : x
  2. Step 2: Convert to fraction form
    281.45/388.31 = 194.17/x
  3. Step 3: Cross multiply
    281.45x = 388.31 × 194.17
  4. Step 4: Simplify right side
    281.45x = 75,396.21
  5. Step 5: Solve for x
    x = 75,396.21/281.45
  6. Step 6: Final answer
    x = 267.89

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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.