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Finding the Third Proportional to 691 and 1,074

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Solution

The third proportional to 691 and 1,074 is: 1,669.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    691 : 1,074 = 1,074 : x
  2. Step 2: Convert to fraction form
    691/1,074 = 1,074/x
  3. Step 3: Cross multiply
    691x = 1,074 × 1,074
  4. Step 4: Simplify right side
    691x = 1,153,476
  5. Step 5: Solve for x
    x = 1,153,476/691
  6. Step 6: Final answer
    x = 1,669.29

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.