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Finding the Third Proportional to 68 and 79

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Solution

The third proportional to 68 and 79 is: 91.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    68 : 79 = 79 : x
  2. Step 2: Convert to fraction form
    68/79 = 79/x
  3. Step 3: Cross multiply
    68x = 79 × 79
  4. Step 4: Simplify right side
    68x = 6,241
  5. Step 5: Solve for x
    x = 6,241/68
  6. Step 6: Final answer
    x = 91.78

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Why These Related Problems?

These problems maintain the same ratio (1.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.