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Finding the Third Proportional to 428,329 and 642,575.25

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Solution

The third proportional to 428,329 and 642,575.25 is: 963,985.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,329 : 642,575.25 = 642,575.25 : x
  2. Step 2: Convert to fraction form
    428,329/642,575.25 = 642,575.25/x
  3. Step 3: Cross multiply
    428,329x = 642,575.25 × 642,575.25
  4. Step 4: Simplify right side
    428,329x = 412,902,951,912.56
  5. Step 5: Solve for x
    x = 412,902,951,912.56/428,329
  6. Step 6: Final answer
    x = 963,985.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.