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Finding the Third Proportional to 742 and 1,720

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Solution

The third proportional to 742 and 1,720 is: 3,987.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    742 : 1,720 = 1,720 : x
  2. Step 2: Convert to fraction form
    742/1,720 = 1,720/x
  3. Step 3: Cross multiply
    742x = 1,720 × 1,720
  4. Step 4: Simplify right side
    742x = 2,958,400
  5. Step 5: Solve for x
    x = 2,958,400/742
  6. Step 6: Final answer
    x = 3,987.06

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Why These Related Problems?

These problems maintain the same ratio (2.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.