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Finding the Third Proportional to 57.75 and 128.44

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Solution

The third proportional to 57.75 and 128.44 is: 285.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.75 : 128.44 = 128.44 : x
  2. Step 2: Convert to fraction form
    57.75/128.44 = 128.44/x
  3. Step 3: Cross multiply
    57.75x = 128.44 × 128.44
  4. Step 4: Simplify right side
    57.75x = 16,496.19
  5. Step 5: Solve for x
    x = 16,496.19/57.75
  6. Step 6: Final answer
    x = 285.65

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.