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Finding the Third Proportional to 20,520 and 30,645

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Solution

The third proportional to 20,520 and 30,645 is: 45,765.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,520 : 30,645 = 30,645 : x
  2. Step 2: Convert to fraction form
    20,520/30,645 = 30,645/x
  3. Step 3: Cross multiply
    20,520x = 30,645 × 30,645
  4. Step 4: Simplify right side
    20,520x = 939,116,025
  5. Step 5: Solve for x
    x = 939,116,025/20,520
  6. Step 6: Final answer
    x = 45,765.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.