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Finding the Third Proportional to 70 and 76.38

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Solution

The third proportional to 70 and 76.38 is: 83.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    70 : 76.38 = 76.38 : x
  2. Step 2: Convert to fraction form
    70/76.38 = 76.38/x
  3. Step 3: Cross multiply
    70x = 76.38 × 76.38
  4. Step 4: Simplify right side
    70x = 5,833.14
  5. Step 5: Solve for x
    x = 5,833.14/70
  6. Step 6: Final answer
    x = 83.33

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.