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Finding the Third Proportional to 7,916 and 12,966

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Solution

The third proportional to 7,916 and 12,966 is: 21,237.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,916 : 12,966 = 12,966 : x
  2. Step 2: Convert to fraction form
    7,916/12,966 = 12,966/x
  3. Step 3: Cross multiply
    7,916x = 12,966 × 12,966
  4. Step 4: Simplify right side
    7,916x = 168,117,156
  5. Step 5: Solve for x
    x = 168,117,156/7,916
  6. Step 6: Final answer
    x = 21,237.64

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.