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Finding the Third Proportional to 311,944 and 638,639

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Solution

The third proportional to 311,944 and 638,639 is: 1,307,477.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    311,944 : 638,639 = 638,639 : x
  2. Step 2: Convert to fraction form
    311,944/638,639 = 638,639/x
  3. Step 3: Cross multiply
    311,944x = 638,639 × 638,639
  4. Step 4: Simplify right side
    311,944x = 407,859,772,321
  5. Step 5: Solve for x
    x = 407,859,772,321/311,944
  6. Step 6: Final answer
    x = 1,307,477.54

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.