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Finding the Third Proportional to 307,920 and 661,680

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Solution

The third proportional to 307,920 and 661,680 is: 1,421,864.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    307,920 : 661,680 = 661,680 : x
  2. Step 2: Convert to fraction form
    307,920/661,680 = 661,680/x
  3. Step 3: Cross multiply
    307,920x = 661,680 × 661,680
  4. Step 4: Simplify right side
    307,920x = 437,820,422,400
  5. Step 5: Solve for x
    x = 437,820,422,400/307,920
  6. Step 6: Final answer
    x = 1,421,864.19

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.