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Finding the Third Proportional to 420,039 and 921,720

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Solution

The third proportional to 420,039 and 921,720 is: 2,022,592.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,039 : 921,720 = 921,720 : x
  2. Step 2: Convert to fraction form
    420,039/921,720 = 921,720/x
  3. Step 3: Cross multiply
    420,039x = 921,720 × 921,720
  4. Step 4: Simplify right side
    420,039x = 849,567,758,400
  5. Step 5: Solve for x
    x = 849,567,758,400/420,039
  6. Step 6: Final answer
    x = 2,022,592.56

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.