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Finding the Third Proportional to 21,787 and 38,420

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Solution

The third proportional to 21,787 and 38,420 is: 67,751.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,787 : 38,420 = 38,420 : x
  2. Step 2: Convert to fraction form
    21,787/38,420 = 38,420/x
  3. Step 3: Cross multiply
    21,787x = 38,420 × 38,420
  4. Step 4: Simplify right side
    21,787x = 1,476,096,400
  5. Step 5: Solve for x
    x = 1,476,096,400/21,787
  6. Step 6: Final answer
    x = 67,751.25

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Why These Related Problems?

These problems maintain the same ratio (1.76) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.