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Finding the Fourth Proportional to 17.21, 25.79 and 12.71

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Solution

The fourth proportional to 17.21, 25.79 and 12.71 is: 19.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.21 : 25.79 = 12.71 : x
  2. Step 2: Convert to fraction form
    17.21/25.79 = 12.71/x
  3. Step 3: Cross multiply
    17.21x = 25.79 × 12.71
  4. Step 4: Simplify right side
    17.21x = 327.60
  5. Step 5: Solve for x
    x = 327.60/17.21
  6. Step 6: Final answer
    x = 19.04

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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.