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Finding the Third Proportional to 21,158 and 29,720

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Solution

The third proportional to 21,158 and 29,720 is: 41,746.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,158 : 29,720 = 29,720 : x
  2. Step 2: Convert to fraction form
    21,158/29,720 = 29,720/x
  3. Step 3: Cross multiply
    21,158x = 29,720 × 29,720
  4. Step 4: Simplify right side
    21,158x = 883,278,400
  5. Step 5: Solve for x
    x = 883,278,400/21,158
  6. Step 6: Final answer
    x = 41,746.78

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.