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Finding the Third Proportional to 309,108 and 651,420

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Solution

The third proportional to 309,108 and 651,420 is: 1,372,814.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,108 : 651,420 = 651,420 : x
  2. Step 2: Convert to fraction form
    309,108/651,420 = 651,420/x
  3. Step 3: Cross multiply
    309,108x = 651,420 × 651,420
  4. Step 4: Simplify right side
    309,108x = 424,348,016,400
  5. Step 5: Solve for x
    x = 424,348,016,400/309,108
  6. Step 6: Final answer
    x = 1,372,814.73

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.