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Finding the Third Proportional to 820 and 2,122

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Solution

The third proportional to 820 and 2,122 is: 5,491.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    820 : 2,122 = 2,122 : x
  2. Step 2: Convert to fraction form
    820/2,122 = 2,122/x
  3. Step 3: Cross multiply
    820x = 2,122 × 2,122
  4. Step 4: Simplify right side
    820x = 4,502,884
  5. Step 5: Solve for x
    x = 4,502,884/820
  6. Step 6: Final answer
    x = 5,491.32

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Why These Related Problems?

These problems maintain the same ratio (2.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.