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Finding the Third Proportional to 1,238 and 2,690

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Solution

The third proportional to 1,238 and 2,690 is: 5,844.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238 : 2,690 = 2,690 : x
  2. Step 2: Convert to fraction form
    1,238/2,690 = 2,690/x
  3. Step 3: Cross multiply
    1,238x = 2,690 × 2,690
  4. Step 4: Simplify right side
    1,238x = 7,236,100
  5. Step 5: Solve for x
    x = 7,236,100/1,238
  6. Step 6: Final answer
    x = 5,844.99

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.