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Finding the Third Proportional to 420,880 and 631,806

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Solution

The third proportional to 420,880 and 631,806 is: 948,438.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,880 : 631,806 = 631,806 : x
  2. Step 2: Convert to fraction form
    420,880/631,806 = 631,806/x
  3. Step 3: Cross multiply
    420,880x = 631,806 × 631,806
  4. Step 4: Simplify right side
    420,880x = 399,178,821,636
  5. Step 5: Solve for x
    x = 399,178,821,636/420,880
  6. Step 6: Final answer
    x = 948,438.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.