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Finding the Third Proportional to 21,880 and 47,420

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Solution

The third proportional to 21,880 and 47,420 is: 102,772.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,880 : 47,420 = 47,420 : x
  2. Step 2: Convert to fraction form
    21,880/47,420 = 47,420/x
  3. Step 3: Cross multiply
    21,880x = 47,420 × 47,420
  4. Step 4: Simplify right side
    21,880x = 2,248,656,400
  5. Step 5: Solve for x
    x = 2,248,656,400/21,880
  6. Step 6: Final answer
    x = 102,772.23

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.