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Finding the Third Proportional to 12.15 and 17.75

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Solution

The third proportional to 12.15 and 17.75 is: 25.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.15 : 17.75 = 17.75 : x
  2. Step 2: Convert to fraction form
    12.15/17.75 = 17.75/x
  3. Step 3: Cross multiply
    12.15x = 17.75 × 17.75
  4. Step 4: Simplify right side
    12.15x = 315.18
  5. Step 5: Solve for x
    x = 315.18/12.15
  6. Step 6: Final answer
    x = 25.95

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.