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Finding the Fourth Proportional to 3,321.90, 4,978.26 and 1,679.52

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Solution

The fourth proportional to 3,321.90, 4,978.26 and 1,679.52 is: 2,516.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,321.90 : 4,978.26 = 1,679.52 : x
  2. Step 2: Convert to fraction form
    3,321.90/4,978.26 = 1,679.52/x
  3. Step 3: Cross multiply
    3,321.90x = 4,978.26 × 1,679.52
  4. Step 4: Simplify right side
    3,321.90x = 8,361,087.24
  5. Step 5: Solve for x
    x = 8,361,087.24/3,321.90
  6. Step 6: Final answer
    x = 2,516.96

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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.