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Finding the Third Proportional to 687 and 1,511

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Solution

The third proportional to 687 and 1,511 is: 3,323.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    687 : 1,511 = 1,511 : x
  2. Step 2: Convert to fraction form
    687/1,511 = 1,511/x
  3. Step 3: Cross multiply
    687x = 1,511 × 1,511
  4. Step 4: Simplify right side
    687x = 2,283,121
  5. Step 5: Solve for x
    x = 2,283,121/687
  6. Step 6: Final answer
    x = 3,323.32

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.