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Finding the Third Proportional to 2,158 and 4,361

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Solution

The third proportional to 2,158 and 4,361 is: 8,812.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,158 : 4,361 = 4,361 : x
  2. Step 2: Convert to fraction form
    2,158/4,361 = 4,361/x
  3. Step 3: Cross multiply
    2,158x = 4,361 × 4,361
  4. Step 4: Simplify right side
    2,158x = 19,018,321
  5. Step 5: Solve for x
    x = 19,018,321/2,158
  6. Step 6: Final answer
    x = 8,812.94

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Why These Related Problems?

These problems maintain the same ratio (2.02) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.