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Finding the Third Proportional to 7.69 and 12.56

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Solution

The third proportional to 7.69 and 12.56 is: 20.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.69 : 12.56 = 12.56 : x
  2. Step 2: Convert to fraction form
    7.69/12.56 = 12.56/x
  3. Step 3: Cross multiply
    7.69x = 12.56 × 12.56
  4. Step 4: Simplify right side
    7.69x = 157.82
  5. Step 5: Solve for x
    x = 157.82/7.69
  6. Step 6: Final answer
    x = 20.53

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Why These Related Problems?

These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.