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Finding the Fourth Proportional to 3,980.88, 5,982.12 and 2,690.28

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Solution

The fourth proportional to 3,980.88, 5,982.12 and 2,690.28 is: 4,042.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,980.88 : 5,982.12 = 2,690.28 : x
  2. Step 2: Convert to fraction form
    3,980.88/5,982.12 = 2,690.28/x
  3. Step 3: Cross multiply
    3,980.88x = 5,982.12 × 2,690.28
  4. Step 4: Simplify right side
    3,980.88x = 16,093,577.79
  5. Step 5: Solve for x
    x = 16,093,577.79/3,980.88
  6. Step 6: Final answer
    x = 4,042.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.