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Finding the Third Proportional to 4,380 and 7,116

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Solution

The third proportional to 4,380 and 7,116 is: 11,561.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,380 : 7,116 = 7,116 : x
  2. Step 2: Convert to fraction form
    4,380/7,116 = 7,116/x
  3. Step 3: Cross multiply
    4,380x = 7,116 × 7,116
  4. Step 4: Simplify right side
    4,380x = 50,637,456
  5. Step 5: Solve for x
    x = 50,637,456/4,380
  6. Step 6: Final answer
    x = 11,561.06

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Why These Related Problems?

These problems maintain the same ratio (1.62) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.