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Finding the Third Proportional to 54.28 and 76.78

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Solution

The third proportional to 54.28 and 76.78 is: 108.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.28 : 76.78 = 76.78 : x
  2. Step 2: Convert to fraction form
    54.28/76.78 = 76.78/x
  3. Step 3: Cross multiply
    54.28x = 76.78 × 76.78
  4. Step 4: Simplify right side
    54.28x = 5,895.36
  5. Step 5: Solve for x
    x = 5,895.36/54.28
  6. Step 6: Final answer
    x = 108.61

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.