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Finding the Third Proportional to 207,318 and 312,439

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Solution

The third proportional to 207,318 and 312,439 is: 470,861.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,318 : 312,439 = 312,439 : x
  2. Step 2: Convert to fraction form
    207,318/312,439 = 312,439/x
  3. Step 3: Cross multiply
    207,318x = 312,439 × 312,439
  4. Step 4: Simplify right side
    207,318x = 97,618,128,721
  5. Step 5: Solve for x
    x = 97,618,128,721/207,318
  6. Step 6: Final answer
    x = 470,861.81

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.