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Finding the Third Proportional to 69.38 and 74.38

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Solution

The third proportional to 69.38 and 74.38 is: 79.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.38 : 74.38 = 74.38 : x
  2. Step 2: Convert to fraction form
    69.38/74.38 = 74.38/x
  3. Step 3: Cross multiply
    69.38x = 74.38 × 74.38
  4. Step 4: Simplify right side
    69.38x = 5,531.64
  5. Step 5: Solve for x
    x = 5,531.64/69.38
  6. Step 6: Final answer
    x = 79.74

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Why These Related Problems?

These problems maintain the same ratio (1.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.