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Finding the Third Proportional to 378,690 and 816,428

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Solution

The third proportional to 378,690 and 816,428 is: 1,760,159.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,690 : 816,428 = 816,428 : x
  2. Step 2: Convert to fraction form
    378,690/816,428 = 816,428/x
  3. Step 3: Cross multiply
    378,690x = 816,428 × 816,428
  4. Step 4: Simplify right side
    378,690x = 666,554,679,184
  5. Step 5: Solve for x
    x = 666,554,679,184/378,690
  6. Step 6: Final answer
    x = 1,760,159.18

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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.