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Finding the Fourth Proportional to 3,940.71, 5,438.13 and 2,936.91

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Solution

The fourth proportional to 3,940.71, 5,438.13 and 2,936.91 is: 4,052.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.71 : 5,438.13 = 2,936.91 : x
  2. Step 2: Convert to fraction form
    3,940.71/5,438.13 = 2,936.91/x
  3. Step 3: Cross multiply
    3,940.71x = 5,438.13 × 2,936.91
  4. Step 4: Simplify right side
    3,940.71x = 15,971,298.38
  5. Step 5: Solve for x
    x = 15,971,298.38/3,940.71
  6. Step 6: Final answer
    x = 4,052.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.