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Finding the Third Proportional to 789 and 1,281

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Solution

The third proportional to 789 and 1,281 is: 2,079.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    789 : 1,281 = 1,281 : x
  2. Step 2: Convert to fraction form
    789/1,281 = 1,281/x
  3. Step 3: Cross multiply
    789x = 1,281 × 1,281
  4. Step 4: Simplify right side
    789x = 1,640,961
  5. Step 5: Solve for x
    x = 1,640,961/789
  6. Step 6: Final answer
    x = 2,079.80

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Why These Related Problems?

These problems maintain the same ratio (1.62) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.