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Finding the Third Proportional to 1,278 and 2,647

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Solution

The third proportional to 1,278 and 2,647 is: 5,482.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278 : 2,647 = 2,647 : x
  2. Step 2: Convert to fraction form
    1,278/2,647 = 2,647/x
  3. Step 3: Cross multiply
    1,278x = 2,647 × 2,647
  4. Step 4: Simplify right side
    1,278x = 7,006,609
  5. Step 5: Solve for x
    x = 7,006,609/1,278
  6. Step 6: Final answer
    x = 5,482.48

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Why These Related Problems?

These problems maintain the same ratio (2.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.