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Finding the Third Proportional to 987 and 1,281

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Solution

The third proportional to 987 and 1,281 is: 1,662.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    987 : 1,281 = 1,281 : x
  2. Step 2: Convert to fraction form
    987/1,281 = 1,281/x
  3. Step 3: Cross multiply
    987x = 1,281 × 1,281
  4. Step 4: Simplify right side
    987x = 1,640,961
  5. Step 5: Solve for x
    x = 1,640,961/987
  6. Step 6: Final answer
    x = 1,662.57

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.