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Finding the Third Proportional to 3,939.75 and 5,613.75

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Solution

The third proportional to 3,939.75 and 5,613.75 is: 7,999.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.75 : 5,613.75 = 5,613.75 : x
  2. Step 2: Convert to fraction form
    3,939.75/5,613.75 = 5,613.75/x
  3. Step 3: Cross multiply
    3,939.75x = 5,613.75 × 5,613.75
  4. Step 4: Simplify right side
    3,939.75x = 31,514,189.06
  5. Step 5: Solve for x
    x = 31,514,189.06/3,939.75
  6. Step 6: Final answer
    x = 7,999.03

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.