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Finding the Fourth Proportional to 2,129.43, 3,194.15 and 668.70

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Solution

The fourth proportional to 2,129.43, 3,194.15 and 668.70 is: 1,003.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.43 : 3,194.15 = 668.70 : x
  2. Step 2: Convert to fraction form
    2,129.43/3,194.15 = 668.70/x
  3. Step 3: Cross multiply
    2,129.43x = 3,194.15 × 668.70
  4. Step 4: Simplify right side
    2,129.43x = 2,135,924.76
  5. Step 5: Solve for x
    x = 2,135,924.76/2,129.43
  6. Step 6: Final answer
    x = 1,003.05

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1.5x scale

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.