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Finding the Third Proportional to 307,638 and 646,380

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Solution

The third proportional to 307,638 and 646,380 is: 1,358,112.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    307,638 : 646,380 = 646,380 : x
  2. Step 2: Convert to fraction form
    307,638/646,380 = 646,380/x
  3. Step 3: Cross multiply
    307,638x = 646,380 × 646,380
  4. Step 4: Simplify right side
    307,638x = 417,807,104,400
  5. Step 5: Solve for x
    x = 417,807,104,400/307,638
  6. Step 6: Final answer
    x = 1,358,112.80

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.