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Finding the Fourth Proportional to 16.81, 25.17 and 12.31

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Solution

The fourth proportional to 16.81, 25.17 and 12.31 is: 18.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.81 : 25.17 = 12.31 : x
  2. Step 2: Convert to fraction form
    16.81/25.17 = 12.31/x
  3. Step 3: Cross multiply
    16.81x = 25.17 × 12.31
  4. Step 4: Simplify right side
    16.81x = 309.73
  5. Step 5: Solve for x
    x = 309.73/16.81
  6. Step 6: Final answer
    x = 18.42

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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.