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Finding the Fourth Proportional to 3,249.64, 4,485 and 1,991.44

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Solution

The fourth proportional to 3,249.64, 4,485 and 1,991.44 is: 2,748.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,249.64 : 4,485 = 1,991.44 : x
  2. Step 2: Convert to fraction form
    3,249.64/4,485 = 1,991.44/x
  3. Step 3: Cross multiply
    3,249.64x = 4,485 × 1,991.44
  4. Step 4: Simplify right side
    3,249.64x = 8,931,608.40
  5. Step 5: Solve for x
    x = 8,931,608.40/3,249.64
  6. Step 6: Final answer
    x = 2,748.49

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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.