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Finding the Third Proportional to 299,779 and 642,291

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Solution

The third proportional to 299,779 and 642,291 is: 1,376,139.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    299,779 : 642,291 = 642,291 : x
  2. Step 2: Convert to fraction form
    299,779/642,291 = 642,291/x
  3. Step 3: Cross multiply
    299,779x = 642,291 × 642,291
  4. Step 4: Simplify right side
    299,779x = 412,537,728,681
  5. Step 5: Solve for x
    x = 412,537,728,681/299,779
  6. Step 6: Final answer
    x = 1,376,139.52

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.