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Finding the Third Proportional to 1,647 and 3,487

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Solution

The third proportional to 1,647 and 3,487 is: 7,382.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,647 : 3,487 = 3,487 : x
  2. Step 2: Convert to fraction form
    1,647/3,487 = 3,487/x
  3. Step 3: Cross multiply
    1,647x = 3,487 × 3,487
  4. Step 4: Simplify right side
    1,647x = 12,159,169
  5. Step 5: Solve for x
    x = 12,159,169/1,647
  6. Step 6: Final answer
    x = 7,382.62

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.