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Finding the Third Proportional to 421,550 and 642,829

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Solution

The third proportional to 421,550 and 642,829 is: 980,261.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,550 : 642,829 = 642,829 : x
  2. Step 2: Convert to fraction form
    421,550/642,829 = 642,829/x
  3. Step 3: Cross multiply
    421,550x = 642,829 × 642,829
  4. Step 4: Simplify right side
    421,550x = 413,229,123,241
  5. Step 5: Solve for x
    x = 413,229,123,241/421,550
  6. Step 6: Final answer
    x = 980,261.23

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.