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Finding the Third Proportional to 7,880 and 11,390

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Solution

The third proportional to 7,880 and 11,390 is: 16,463.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,880 : 11,390 = 11,390 : x
  2. Step 2: Convert to fraction form
    7,880/11,390 = 11,390/x
  3. Step 3: Cross multiply
    7,880x = 11,390 × 11,390
  4. Step 4: Simplify right side
    7,880x = 129,732,100
  5. Step 5: Solve for x
    x = 129,732,100/7,880
  6. Step 6: Final answer
    x = 16,463.46

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.