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Finding the Third Proportional to 331,378.50 and 518,391

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Solution

The third proportional to 331,378.50 and 518,391 is: 810,943.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    331,378.50 : 518,391 = 518,391 : x
  2. Step 2: Convert to fraction form
    331,378.50/518,391 = 518,391/x
  3. Step 3: Cross multiply
    331,378.50x = 518,391 × 518,391
  4. Step 4: Simplify right side
    331,378.50x = 268,729,228,881
  5. Step 5: Solve for x
    x = 268,729,228,881/331,378.50
  6. Step 6: Final answer
    x = 810,943.46

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.