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Finding the Third Proportional to 17 and 21.25

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Solution

The third proportional to 17 and 21.25 is: 26.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    17 : 21.25 = 21.25 : x
  2. Step 2: Convert to fraction form
    17/21.25 = 21.25/x
  3. Step 3: Cross multiply
    17x = 21.25 × 21.25
  4. Step 4: Simplify right side
    17x = 451.56
  5. Step 5: Solve for x
    x = 451.56/17
  6. Step 6: Final answer
    x = 26.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.25) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.