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Finding the Third Proportional to 781 and 1,438

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Solution

The third proportional to 781 and 1,438 is: 2,647.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    781 : 1,438 = 1,438 : x
  2. Step 2: Convert to fraction form
    781/1,438 = 1,438/x
  3. Step 3: Cross multiply
    781x = 1,438 × 1,438
  4. Step 4: Simplify right side
    781x = 2,067,844
  5. Step 5: Solve for x
    x = 2,067,844/781
  6. Step 6: Final answer
    x = 2,647.69

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Why These Related Problems?

These problems maintain the same ratio (1.84) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.