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Finding the Third Proportional to 321,816 and 686,364

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Solution

The third proportional to 321,816 and 686,364 is: 1,463,866.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,816 : 686,364 = 686,364 : x
  2. Step 2: Convert to fraction form
    321,816/686,364 = 686,364/x
  3. Step 3: Cross multiply
    321,816x = 686,364 × 686,364
  4. Step 4: Simplify right side
    321,816x = 471,095,540,496
  5. Step 5: Solve for x
    x = 471,095,540,496/321,816
  6. Step 6: Final answer
    x = 1,463,866.12

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.