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Finding the Fourth Proportional to 281.28, 388.17 and 170.79

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Solution

The fourth proportional to 281.28, 388.17 and 170.79 is: 235.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.28 : 388.17 = 170.79 : x
  2. Step 2: Convert to fraction form
    281.28/388.17 = 170.79/x
  3. Step 3: Cross multiply
    281.28x = 388.17 × 170.79
  4. Step 4: Simplify right side
    281.28x = 66,295.55
  5. Step 5: Solve for x
    x = 66,295.55/281.28
  6. Step 6: Final answer
    x = 235.69

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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.