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Finding the Third Proportional to 8,311 and 12,457

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Solution

The third proportional to 8,311 and 12,457 is: 18,671.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,311 : 12,457 = 12,457 : x
  2. Step 2: Convert to fraction form
    8,311/12,457 = 12,457/x
  3. Step 3: Cross multiply
    8,311x = 12,457 × 12,457
  4. Step 4: Simplify right side
    8,311x = 155,176,849
  5. Step 5: Solve for x
    x = 155,176,849/8,311
  6. Step 6: Final answer
    x = 18,671.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.