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Finding the Third Proportional to 2,190 and 3,936

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Solution

The third proportional to 2,190 and 3,936 is: 7,074.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,190 : 3,936 = 3,936 : x
  2. Step 2: Convert to fraction form
    2,190/3,936 = 3,936/x
  3. Step 3: Cross multiply
    2,190x = 3,936 × 3,936
  4. Step 4: Simplify right side
    2,190x = 15,492,096
  5. Step 5: Solve for x
    x = 15,492,096/2,190
  6. Step 6: Final answer
    x = 7,074.02

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Why These Related Problems?

These problems maintain the same ratio (1.80) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.