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Finding the Fourth Proportional to 3,940.38, 5,908.42 and 1,961.67

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Solution

The fourth proportional to 3,940.38, 5,908.42 and 1,961.67 is: 2,941.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.38 : 5,908.42 = 1,961.67 : x
  2. Step 2: Convert to fraction form
    3,940.38/5,908.42 = 1,961.67/x
  3. Step 3: Cross multiply
    3,940.38x = 5,908.42 × 1,961.67
  4. Step 4: Simplify right side
    3,940.38x = 11,590,370.26
  5. Step 5: Solve for x
    x = 11,590,370.26/3,940.38
  6. Step 6: Final answer
    x = 2,941.43

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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.