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Finding the Third Proportional to 771 and 1,272

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Solution

The third proportional to 771 and 1,272 is: 2,098.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    771 : 1,272 = 1,272 : x
  2. Step 2: Convert to fraction form
    771/1,272 = 1,272/x
  3. Step 3: Cross multiply
    771x = 1,272 × 1,272
  4. Step 4: Simplify right side
    771x = 1,617,984
  5. Step 5: Solve for x
    x = 1,617,984/771
  6. Step 6: Final answer
    x = 2,098.55

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Why These Related Problems?

These problems maintain the same ratio (1.65) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.