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Finding the Third Proportional to 686 and 1,574

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Solution

The third proportional to 686 and 1,574 is: 3,611.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    686 : 1,574 = 1,574 : x
  2. Step 2: Convert to fraction form
    686/1,574 = 1,574/x
  3. Step 3: Cross multiply
    686x = 1,574 × 1,574
  4. Step 4: Simplify right side
    686x = 2,477,476
  5. Step 5: Solve for x
    x = 2,477,476/686
  6. Step 6: Final answer
    x = 3,611.48

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Why These Related Problems?

These problems maintain the same ratio (2.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.