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Finding the Third Proportional to 4,879 and 7,420

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Solution

The third proportional to 4,879 and 7,420 is: 11,284.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,879 : 7,420 = 7,420 : x
  2. Step 2: Convert to fraction form
    4,879/7,420 = 7,420/x
  3. Step 3: Cross multiply
    4,879x = 7,420 × 7,420
  4. Step 4: Simplify right side
    4,879x = 55,056,400
  5. Step 5: Solve for x
    x = 55,056,400/4,879
  6. Step 6: Final answer
    x = 11,284.36

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.