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Finding the Third Proportional to 54.38 and 87.38

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Solution

The third proportional to 54.38 and 87.38 is: 140.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.38 : 87.38 = 87.38 : x
  2. Step 2: Convert to fraction form
    54.38/87.38 = 87.38/x
  3. Step 3: Cross multiply
    54.38x = 87.38 × 87.38
  4. Step 4: Simplify right side
    54.38x = 7,634.39
  5. Step 5: Solve for x
    x = 7,634.39/54.38
  6. Step 6: Final answer
    x = 140.40

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.