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Finding the Third Proportional to 987 and 1,615

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Solution

The third proportional to 987 and 1,615 is: 2,642.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    987 : 1,615 = 1,615 : x
  2. Step 2: Convert to fraction form
    987/1,615 = 1,615/x
  3. Step 3: Cross multiply
    987x = 1,615 × 1,615
  4. Step 4: Simplify right side
    987x = 2,608,225
  5. Step 5: Solve for x
    x = 2,608,225/987
  6. Step 6: Final answer
    x = 2,642.58

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.