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Finding the Third Proportional to 299,456 and 642,724

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Solution

The third proportional to 299,456 and 642,724 is: 1,379,481.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    299,456 : 642,724 = 642,724 : x
  2. Step 2: Convert to fraction form
    299,456/642,724 = 642,724/x
  3. Step 3: Cross multiply
    299,456x = 642,724 × 642,724
  4. Step 4: Simplify right side
    299,456x = 413,094,140,176
  5. Step 5: Solve for x
    x = 413,094,140,176/299,456
  6. Step 6: Final answer
    x = 1,379,481.93

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.