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Finding the Third Proportional to 781 and 1,891

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Solution

The third proportional to 781 and 1,891 is: 4,578.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    781 : 1,891 = 1,891 : x
  2. Step 2: Convert to fraction form
    781/1,891 = 1,891/x
  3. Step 3: Cross multiply
    781x = 1,891 × 1,891
  4. Step 4: Simplify right side
    781x = 3,575,881
  5. Step 5: Solve for x
    x = 3,575,881/781
  6. Step 6: Final answer
    x = 4,578.59

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Why These Related Problems?

These problems maintain the same ratio (2.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.