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Finding the Third Proportional to 21,520 and 47,390

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Solution

The third proportional to 21,520 and 47,390 is: 104,359.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,520 : 47,390 = 47,390 : x
  2. Step 2: Convert to fraction form
    21,520/47,390 = 47,390/x
  3. Step 3: Cross multiply
    21,520x = 47,390 × 47,390
  4. Step 4: Simplify right side
    21,520x = 2,245,812,100
  5. Step 5: Solve for x
    x = 2,245,812,100/21,520
  6. Step 6: Final answer
    x = 104,359.30

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.