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Finding the Fourth Proportional to 281.21, 388.11 and 170.66

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Solution

The fourth proportional to 281.21, 388.11 and 170.66 is: 235.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.21 : 388.11 = 170.66 : x
  2. Step 2: Convert to fraction form
    281.21/388.11 = 170.66/x
  3. Step 3: Cross multiply
    281.21x = 388.11 × 170.66
  4. Step 4: Simplify right side
    281.21x = 66,234.37
  5. Step 5: Solve for x
    x = 66,234.37/281.21
  6. Step 6: Final answer
    x = 235.54

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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.