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Finding the Third Proportional to 7,320 and 8,112

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Solution

The third proportional to 7,320 and 8,112 is: 8,989.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,320 : 8,112 = 8,112 : x
  2. Step 2: Convert to fraction form
    7,320/8,112 = 8,112/x
  3. Step 3: Cross multiply
    7,320x = 8,112 × 8,112
  4. Step 4: Simplify right side
    7,320x = 65,804,544
  5. Step 5: Solve for x
    x = 65,804,544/7,320
  6. Step 6: Final answer
    x = 8,989.69

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.