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Finding the Third Proportional to 309,480 and 678,009

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Solution

The third proportional to 309,480 and 678,009 is: 1,485,382.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,480 : 678,009 = 678,009 : x
  2. Step 2: Convert to fraction form
    309,480/678,009 = 678,009/x
  3. Step 3: Cross multiply
    309,480x = 678,009 × 678,009
  4. Step 4: Simplify right side
    309,480x = 459,696,204,081
  5. Step 5: Solve for x
    x = 459,696,204,081/309,480
  6. Step 6: Final answer
    x = 1,485,382.59

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.