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Finding the Third Proportional to 721 and 1,015

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Solution

The third proportional to 721 and 1,015 is: 1,428.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    721 : 1,015 = 1,015 : x
  2. Step 2: Convert to fraction form
    721/1,015 = 1,015/x
  3. Step 3: Cross multiply
    721x = 1,015 × 1,015
  4. Step 4: Simplify right side
    721x = 1,030,225
  5. Step 5: Solve for x
    x = 1,030,225/721
  6. Step 6: Final answer
    x = 1,428.88

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.