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Finding the Third Proportional to 7.78 and 20.44

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Solution

The third proportional to 7.78 and 20.44 is: 53.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.78 : 20.44 = 20.44 : x
  2. Step 2: Convert to fraction form
    7.78/20.44 = 20.44/x
  3. Step 3: Cross multiply
    7.78x = 20.44 × 20.44
  4. Step 4: Simplify right side
    7.78x = 417.69
  5. Step 5: Solve for x
    x = 417.69/7.78
  6. Step 6: Final answer
    x = 53.68

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Why These Related Problems?

These problems maintain the same ratio (2.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.