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Finding the Third Proportional to 1,289 and 1,939

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Solution

The third proportional to 1,289 and 1,939 is: 2,916.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289 : 1,939 = 1,939 : x
  2. Step 2: Convert to fraction form
    1,289/1,939 = 1,939/x
  3. Step 3: Cross multiply
    1,289x = 1,939 × 1,939
  4. Step 4: Simplify right side
    1,289x = 3,759,721
  5. Step 5: Solve for x
    x = 3,759,721/1,289
  6. Step 6: Final answer
    x = 2,916.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.