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Finding the Third Proportional to 393,660 and 813,564

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Solution

The third proportional to 393,660 and 813,564 is: 1,681,365.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,660 : 813,564 = 813,564 : x
  2. Step 2: Convert to fraction form
    393,660/813,564 = 813,564/x
  3. Step 3: Cross multiply
    393,660x = 813,564 × 813,564
  4. Step 4: Simplify right side
    393,660x = 661,886,382,096
  5. Step 5: Solve for x
    x = 661,886,382,096/393,660
  6. Step 6: Final answer
    x = 1,681,365.60

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Why These Related Problems?

These problems maintain the same ratio (2.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.