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Finding the Fourth Proportional to 3,970.62, 5,481.27 and 2,979.18

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Solution

The fourth proportional to 3,970.62, 5,481.27 and 2,979.18 is: 4,112.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,970.62 : 5,481.27 = 2,979.18 : x
  2. Step 2: Convert to fraction form
    3,970.62/5,481.27 = 2,979.18/x
  3. Step 3: Cross multiply
    3,970.62x = 5,481.27 × 2,979.18
  4. Step 4: Simplify right side
    3,970.62x = 16,329,689.96
  5. Step 5: Solve for x
    x = 16,329,689.96/3,970.62
  6. Step 6: Final answer
    x = 4,112.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.