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Finding the Third Proportional to 4,920 and 11,928

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Solution

The third proportional to 4,920 and 11,928 is: 28,918.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,920 : 11,928 = 11,928 : x
  2. Step 2: Convert to fraction form
    4,920/11,928 = 11,928/x
  3. Step 3: Cross multiply
    4,920x = 11,928 × 11,928
  4. Step 4: Simplify right side
    4,920x = 142,277,184
  5. Step 5: Solve for x
    x = 142,277,184/4,920
  6. Step 6: Final answer
    x = 28,918.13

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Why These Related Problems?

These problems maintain the same ratio (2.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.