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Finding the Third Proportional to 4,218 and 8,979

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Solution

The third proportional to 4,218 and 8,979 is: 19,113.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,218 : 8,979 = 8,979 : x
  2. Step 2: Convert to fraction form
    4,218/8,979 = 8,979/x
  3. Step 3: Cross multiply
    4,218x = 8,979 × 8,979
  4. Step 4: Simplify right side
    4,218x = 80,622,441
  5. Step 5: Solve for x
    x = 80,622,441/4,218
  6. Step 6: Final answer
    x = 19,113.90

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.