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Finding the Third Proportional to 1,239 and 2,705

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Solution

The third proportional to 1,239 and 2,705 is: 5,905.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239 : 2,705 = 2,705 : x
  2. Step 2: Convert to fraction form
    1,239/2,705 = 2,705/x
  3. Step 3: Cross multiply
    1,239x = 2,705 × 2,705
  4. Step 4: Simplify right side
    1,239x = 7,317,025
  5. Step 5: Solve for x
    x = 7,317,025/1,239
  6. Step 6: Final answer
    x = 5,905.59

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.