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Finding the Fourth Proportional to 3,453.75, 5,174.48 and 1,989.88

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Solution

The fourth proportional to 3,453.75, 5,174.48 and 1,989.88 is: 2,981.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,453.75 : 5,174.48 = 1,989.88 : x
  2. Step 2: Convert to fraction form
    3,453.75/5,174.48 = 1,989.88/x
  3. Step 3: Cross multiply
    3,453.75x = 5,174.48 × 1,989.88
  4. Step 4: Simplify right side
    3,453.75x = 10,296,586.30
  5. Step 5: Solve for x
    x = 10,296,586.30/3,453.75
  6. Step 6: Final answer
    x = 2,981.28

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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.