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Finding the Third Proportional to 1,279 and 3,159

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Solution

The third proportional to 1,279 and 3,159 is: 7,802.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279 : 3,159 = 3,159 : x
  2. Step 2: Convert to fraction form
    1,279/3,159 = 3,159/x
  3. Step 3: Cross multiply
    1,279x = 3,159 × 3,159
  4. Step 4: Simplify right side
    1,279x = 9,979,281
  5. Step 5: Solve for x
    x = 9,979,281/1,279
  6. Step 6: Final answer
    x = 7,802.41

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Why These Related Problems?

These problems maintain the same ratio (2.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.