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Finding the Third Proportional to 3,979.13 and 4,639.78

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Solution

The third proportional to 3,979.13 and 4,639.78 is: 5,410.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.13 : 4,639.78 = 4,639.78 : x
  2. Step 2: Convert to fraction form
    3,979.13/4,639.78 = 4,639.78/x
  3. Step 3: Cross multiply
    3,979.13x = 4,639.78 × 4,639.78
  4. Step 4: Simplify right side
    3,979.13x = 21,527,570.05
  5. Step 5: Solve for x
    x = 21,527,570.05/3,979.13
  6. Step 6: Final answer
    x = 5,410.13

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Why These Related Problems?

These problems maintain the same ratio (1.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.