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Finding the Third Proportional to 687 and 1,533

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Solution

The third proportional to 687 and 1,533 is: 3,420.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    687 : 1,533 = 1,533 : x
  2. Step 2: Convert to fraction form
    687/1,533 = 1,533/x
  3. Step 3: Cross multiply
    687x = 1,533 × 1,533
  4. Step 4: Simplify right side
    687x = 2,350,089
  5. Step 5: Solve for x
    x = 2,350,089/687
  6. Step 6: Final answer
    x = 3,420.80

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Why These Related Problems?

These problems maintain the same ratio (2.23) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.