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Finding the Third Proportional to 421,105.50 and 647,922.75

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Solution

The third proportional to 421,105.50 and 647,922.75 is: 996,909.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,105.50 : 647,922.75 = 647,922.75 : x
  2. Step 2: Convert to fraction form
    421,105.50/647,922.75 = 647,922.75/x
  3. Step 3: Cross multiply
    421,105.50x = 647,922.75 × 647,922.75
  4. Step 4: Simplify right side
    421,105.50x = 419,803,889,967.56
  5. Step 5: Solve for x
    x = 419,803,889,967.56/421,105.50
  6. Step 6: Final answer
    x = 996,909.06

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.