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Finding the Third Proportional to 987 and 1,479

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Solution

The third proportional to 987 and 1,479 is: 2,216.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    987 : 1,479 = 1,479 : x
  2. Step 2: Convert to fraction form
    987/1,479 = 1,479/x
  3. Step 3: Cross multiply
    987x = 1,479 × 1,479
  4. Step 4: Simplify right side
    987x = 2,187,441
  5. Step 5: Solve for x
    x = 2,187,441/987
  6. Step 6: Final answer
    x = 2,216.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.