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Finding the Third Proportional to 415,446 and 678,321

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Solution

The third proportional to 415,446 and 678,321 is: 1,107,531.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,446 : 678,321 = 678,321 : x
  2. Step 2: Convert to fraction form
    415,446/678,321 = 678,321/x
  3. Step 3: Cross multiply
    415,446x = 678,321 × 678,321
  4. Step 4: Simplify right side
    415,446x = 460,119,379,041
  5. Step 5: Solve for x
    x = 460,119,379,041/415,446
  6. Step 6: Final answer
    x = 1,107,531.13

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Why These Related Problems?

These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.