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Finding the Fourth Proportional to 5,418.60, 8,129.86 and 2,129.88

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Solution

The fourth proportional to 5,418.60, 8,129.86 and 2,129.88 is: 3,195.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,418.60 : 8,129.86 = 2,129.88 : x
  2. Step 2: Convert to fraction form
    5,418.60/8,129.86 = 2,129.88/x
  3. Step 3: Cross multiply
    5,418.60x = 8,129.86 × 2,129.88
  4. Step 4: Simplify right side
    5,418.60x = 17,315,626.22
  5. Step 5: Solve for x
    x = 17,315,626.22/5,418.60
  6. Step 6: Final answer
    x = 3,195.59

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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.