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Finding the Fourth Proportional to 3,936.82, 5,428.30 and 2,940.42

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Solution

The fourth proportional to 3,936.82, 5,428.30 and 2,940.42 is: 4,054.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,936.82 : 5,428.30 = 2,940.42 : x
  2. Step 2: Convert to fraction form
    3,936.82/5,428.30 = 2,940.42/x
  3. Step 3: Cross multiply
    3,936.82x = 5,428.30 × 2,940.42
  4. Step 4: Simplify right side
    3,936.82x = 15,961,454.74
  5. Step 5: Solve for x
    x = 15,961,454.74/3,936.82
  6. Step 6: Final answer
    x = 4,054.41

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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.