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Finding the Third Proportional to 2,916 and 7,122

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Solution

The third proportional to 2,916 and 7,122 is: 17,394.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,916 : 7,122 = 7,122 : x
  2. Step 2: Convert to fraction form
    2,916/7,122 = 7,122/x
  3. Step 3: Cross multiply
    2,916x = 7,122 × 7,122
  4. Step 4: Simplify right side
    2,916x = 50,722,884
  5. Step 5: Solve for x
    x = 50,722,884/2,916
  6. Step 6: Final answer
    x = 17,394.68

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Why These Related Problems?

These problems maintain the same ratio (2.44) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.