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Finding the Third Proportional to 769.78 and 1,651.78

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Solution

The third proportional to 769.78 and 1,651.78 is: 3,544.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.78 : 1,651.78 = 1,651.78 : x
  2. Step 2: Convert to fraction form
    769.78/1,651.78 = 1,651.78/x
  3. Step 3: Cross multiply
    769.78x = 1,651.78 × 1,651.78
  4. Step 4: Simplify right side
    769.78x = 2,728,381.30
  5. Step 5: Solve for x
    x = 2,728,381.30/769.78
  6. Step 6: Final answer
    x = 3,544.36

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.