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Finding the Fourth Proportional to 3,989.64, 5,979.30 and 2,755.08

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Solution

The fourth proportional to 3,989.64, 5,979.30 and 2,755.08 is: 4,129.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.64 : 5,979.30 = 2,755.08 : x
  2. Step 2: Convert to fraction form
    3,989.64/5,979.30 = 2,755.08/x
  3. Step 3: Cross multiply
    3,989.64x = 5,979.30 × 2,755.08
  4. Step 4: Simplify right side
    3,989.64x = 16,473,449.84
  5. Step 5: Solve for x
    x = 16,473,449.84/3,989.64
  6. Step 6: Final answer
    x = 4,129.06

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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.