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Finding the Third Proportional to 12.78 and 18.69

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Solution

The third proportional to 12.78 and 18.69 is: 27.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.78 : 18.69 = 18.69 : x
  2. Step 2: Convert to fraction form
    12.78/18.69 = 18.69/x
  3. Step 3: Cross multiply
    12.78x = 18.69 × 18.69
  4. Step 4: Simplify right side
    12.78x = 349.22
  5. Step 5: Solve for x
    x = 349.22/12.78
  6. Step 6: Final answer
    x = 27.32

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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.