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Finding the Third Proportional to 625.78 and 1,311.19

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Solution

The third proportional to 625.78 and 1,311.19 is: 2,747.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.78 : 1,311.19 = 1,311.19 : x
  2. Step 2: Convert to fraction form
    625.78/1,311.19 = 1,311.19/x
  3. Step 3: Cross multiply
    625.78x = 1,311.19 × 1,311.19
  4. Step 4: Simplify right side
    625.78x = 1,719,212.66
  5. Step 5: Solve for x
    x = 1,719,212.66/625.78
  6. Step 6: Final answer
    x = 2,747.31

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.