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Finding the Third Proportional to 771 and 1,217.25

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Solution

The third proportional to 771 and 1,217.25 is: 1,921.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    771 : 1,217.25 = 1,217.25 : x
  2. Step 2: Convert to fraction form
    771/1,217.25 = 1,217.25/x
  3. Step 3: Cross multiply
    771x = 1,217.25 × 1,217.25
  4. Step 4: Simplify right side
    771x = 1,481,697.56
  5. Step 5: Solve for x
    x = 1,481,697.56/771
  6. Step 6: Final answer
    x = 1,921.79

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.