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Finding the Third Proportional to 691 and 1,505

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Solution

The third proportional to 691 and 1,505 is: 3,277.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    691 : 1,505 = 1,505 : x
  2. Step 2: Convert to fraction form
    691/1,505 = 1,505/x
  3. Step 3: Cross multiply
    691x = 1,505 × 1,505
  4. Step 4: Simplify right side
    691x = 2,265,025
  5. Step 5: Solve for x
    x = 2,265,025/691
  6. Step 6: Final answer
    x = 3,277.89

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.