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Finding the Third Proportional to 7,810 and 12,491

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Solution

The third proportional to 7,810 and 12,491 is: 19,977.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,810 : 12,491 = 12,491 : x
  2. Step 2: Convert to fraction form
    7,810/12,491 = 12,491/x
  3. Step 3: Cross multiply
    7,810x = 12,491 × 12,491
  4. Step 4: Simplify right side
    7,810x = 156,025,081
  5. Step 5: Solve for x
    x = 156,025,081/7,810
  6. Step 6: Final answer
    x = 19,977.60

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.