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Finding the Third Proportional to 1,272 and 2,872

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Solution

The third proportional to 1,272 and 2,872 is: 6,484.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272 : 2,872 = 2,872 : x
  2. Step 2: Convert to fraction form
    1,272/2,872 = 2,872/x
  3. Step 3: Cross multiply
    1,272x = 2,872 × 2,872
  4. Step 4: Simplify right side
    1,272x = 8,248,384
  5. Step 5: Solve for x
    x = 8,248,384/1,272
  6. Step 6: Final answer
    x = 6,484.58

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Why These Related Problems?

These problems maintain the same ratio (2.26) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.