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Finding the Third Proportional to 647 and 1,742

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Solution

The third proportional to 647 and 1,742 is: 4,690.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    647 : 1,742 = 1,742 : x
  2. Step 2: Convert to fraction form
    647/1,742 = 1,742/x
  3. Step 3: Cross multiply
    647x = 1,742 × 1,742
  4. Step 4: Simplify right side
    647x = 3,034,564
  5. Step 5: Solve for x
    x = 3,034,564/647
  6. Step 6: Final answer
    x = 4,690.21

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Why These Related Problems?

These problems maintain the same ratio (2.69) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.