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Finding the Fourth Proportional to 2,129.29, 3,194.08 and 668.55

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Solution

The fourth proportional to 2,129.29, 3,194.08 and 668.55 is: 1,002.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.29 : 3,194.08 = 668.55 : x
  2. Step 2: Convert to fraction form
    2,129.29/3,194.08 = 668.55/x
  3. Step 3: Cross multiply
    2,129.29x = 3,194.08 × 668.55
  4. Step 4: Simplify right side
    2,129.29x = 2,135,416.25
  5. Step 5: Solve for x
    x = 2,135,416.25/2,129.29
  6. Step 6: Final answer
    x = 1,002.88

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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.