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Finding the Third Proportional to 21.75 and 54.38

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Solution

The third proportional to 21.75 and 54.38 is: 135.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.75 : 54.38 = 54.38 : x
  2. Step 2: Convert to fraction form
    21.75/54.38 = 54.38/x
  3. Step 3: Cross multiply
    21.75x = 54.38 × 54.38
  4. Step 4: Simplify right side
    21.75x = 2,956.64
  5. Step 5: Solve for x
    x = 2,956.64/21.75
  6. Step 6: Final answer
    x = 135.94

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Why These Related Problems?

These problems maintain the same ratio (2.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.