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Finding the Third Proportional to 7,128.38 and 11,181.94

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Solution

The third proportional to 7,128.38 and 11,181.94 is: 17,540.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,128.38 : 11,181.94 = 11,181.94 : x
  2. Step 2: Convert to fraction form
    7,128.38/11,181.94 = 11,181.94/x
  3. Step 3: Cross multiply
    7,128.38x = 11,181.94 × 11,181.94
  4. Step 4: Simplify right side
    7,128.38x = 125,035,726.25
  5. Step 5: Solve for x
    x = 125,035,726.25/7,128.38
  6. Step 6: Final answer
    x = 17,540.57

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.