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Finding the Third Proportional to 128.25 and 181.13

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Solution

The third proportional to 128.25 and 181.13 is: 255.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.25 : 181.13 = 181.13 : x
  2. Step 2: Convert to fraction form
    128.25/181.13 = 181.13/x
  3. Step 3: Cross multiply
    128.25x = 181.13 × 181.13
  4. Step 4: Simplify right side
    128.25x = 32,806.27
  5. Step 5: Solve for x
    x = 32,806.27/128.25
  6. Step 6: Final answer
    x = 255.80

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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.