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Finding the Fourth Proportional to 2,129.78, 3,194.64 and 668.94

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Solution

The fourth proportional to 2,129.78, 3,194.64 and 668.94 is: 1,003.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.78 : 3,194.64 = 668.94 : x
  2. Step 2: Convert to fraction form
    2,129.78/3,194.64 = 668.94/x
  3. Step 3: Cross multiply
    2,129.78x = 3,194.64 × 668.94
  4. Step 4: Simplify right side
    2,129.78x = 2,137,022.48
  5. Step 5: Solve for x
    x = 2,137,022.48/2,129.78
  6. Step 6: Final answer
    x = 1,003.40

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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.