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Finding the Third Proportional to 378,820 and 816,680

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Solution

The third proportional to 378,820 and 816,680 is: 1,760,641.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,820 : 816,680 = 816,680 : x
  2. Step 2: Convert to fraction form
    378,820/816,680 = 816,680/x
  3. Step 3: Cross multiply
    378,820x = 816,680 × 816,680
  4. Step 4: Simplify right side
    378,820x = 666,966,222,400
  5. Step 5: Solve for x
    x = 666,966,222,400/378,820
  6. Step 6: Final answer
    x = 1,760,641.52

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.