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Finding the Third Proportional to 7,488 and 11,920

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Solution

The third proportional to 7,488 and 11,920 is: 18,975.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,488 : 11,920 = 11,920 : x
  2. Step 2: Convert to fraction form
    7,488/11,920 = 11,920/x
  3. Step 3: Cross multiply
    7,488x = 11,920 × 11,920
  4. Step 4: Simplify right side
    7,488x = 142,086,400
  5. Step 5: Solve for x
    x = 142,086,400/7,488
  6. Step 6: Final answer
    x = 18,975.21

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.