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Finding the Third Proportional to 4,390 and 6,631

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Solution

The third proportional to 4,390 and 6,631 is: 10,015.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,390 : 6,631 = 6,631 : x
  2. Step 2: Convert to fraction form
    4,390/6,631 = 6,631/x
  3. Step 3: Cross multiply
    4,390x = 6,631 × 6,631
  4. Step 4: Simplify right side
    4,390x = 43,970,161
  5. Step 5: Solve for x
    x = 43,970,161/4,390
  6. Step 6: Final answer
    x = 10,015.98

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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.