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Finding the Fourth Proportional to 3,247.68, 4,481.16 and 1,989

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Solution

The fourth proportional to 3,247.68, 4,481.16 and 1,989 is: 2,744.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,247.68 : 4,481.16 = 1,989 : x
  2. Step 2: Convert to fraction form
    3,247.68/4,481.16 = 1,989/x
  3. Step 3: Cross multiply
    3,247.68x = 4,481.16 × 1,989
  4. Step 4: Simplify right side
    3,247.68x = 8,913,027.24
  5. Step 5: Solve for x
    x = 8,913,027.24/3,247.68
  6. Step 6: Final answer
    x = 2,744.43

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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.