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Finding the Third Proportional to 7,920 and 9,612

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Solution

The third proportional to 7,920 and 9,612 is: 11,665.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920 : 9,612 = 9,612 : x
  2. Step 2: Convert to fraction form
    7,920/9,612 = 9,612/x
  3. Step 3: Cross multiply
    7,920x = 9,612 × 9,612
  4. Step 4: Simplify right side
    7,920x = 92,390,544
  5. Step 5: Solve for x
    x = 92,390,544/7,920
  6. Step 6: Final answer
    x = 11,665.47

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Why These Related Problems?

These problems maintain the same ratio (1.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.