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Finding the Fourth Proportional to 281.29, 421.87 and 107.98

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Solution

The fourth proportional to 281.29, 421.87 and 107.98 is: 161.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.29 : 421.87 = 107.98 : x
  2. Step 2: Convert to fraction form
    281.29/421.87 = 107.98/x
  3. Step 3: Cross multiply
    281.29x = 421.87 × 107.98
  4. Step 4: Simplify right side
    281.29x = 45,553.52
  5. Step 5: Solve for x
    x = 45,553.52/281.29
  6. Step 6: Final answer
    x = 161.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.