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Finding the Third Proportional to 309,612 and 678,276

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Solution

The third proportional to 309,612 and 678,276 is: 1,485,918.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,612 : 678,276 = 678,276 : x
  2. Step 2: Convert to fraction form
    309,612/678,276 = 678,276/x
  3. Step 3: Cross multiply
    309,612x = 678,276 × 678,276
  4. Step 4: Simplify right side
    309,612x = 460,058,332,176
  5. Step 5: Solve for x
    x = 460,058,332,176/309,612
  6. Step 6: Final answer
    x = 1,485,918.93

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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.