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Finding the Third Proportional to 2,121 and 2,321

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Solution

The third proportional to 2,121 and 2,321 is: 2,539.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121 : 2,321 = 2,321 : x
  2. Step 2: Convert to fraction form
    2,121/2,321 = 2,321/x
  3. Step 3: Cross multiply
    2,121x = 2,321 × 2,321
  4. Step 4: Simplify right side
    2,121x = 5,387,041
  5. Step 5: Solve for x
    x = 5,387,041/2,121
  6. Step 6: Final answer
    x = 2,539.86

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.