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Finding the Fourth Proportional to 17.23, 25.81 and 13.21

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Solution

The fourth proportional to 17.23, 25.81 and 13.21 is: 19.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.23 : 25.81 = 13.21 : x
  2. Step 2: Convert to fraction form
    17.23/25.81 = 13.21/x
  3. Step 3: Cross multiply
    17.23x = 25.81 × 13.21
  4. Step 4: Simplify right side
    17.23x = 340.95
  5. Step 5: Solve for x
    x = 340.95/17.23
  6. Step 6: Final answer
    x = 19.79

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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.