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Finding the Third Proportional to 7,920 and 9,132

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Solution

The third proportional to 7,920 and 9,132 is: 10,529.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920 : 9,132 = 9,132 : x
  2. Step 2: Convert to fraction form
    7,920/9,132 = 9,132/x
  3. Step 3: Cross multiply
    7,920x = 9,132 × 9,132
  4. Step 4: Simplify right side
    7,920x = 83,393,424
  5. Step 5: Solve for x
    x = 83,393,424/7,920
  6. Step 6: Final answer
    x = 10,529.47

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.