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Finding the Fourth Proportional to 3,936.78, 5,905.17 and 3,696.21

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Solution

The fourth proportional to 3,936.78, 5,905.17 and 3,696.21 is: 5,544.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,936.78 : 5,905.17 = 3,696.21 : x
  2. Step 2: Convert to fraction form
    3,936.78/5,905.17 = 3,696.21/x
  3. Step 3: Cross multiply
    3,936.78x = 5,905.17 × 3,696.21
  4. Step 4: Simplify right side
    3,936.78x = 21,826,748.41
  5. Step 5: Solve for x
    x = 21,826,748.41/3,936.78
  6. Step 6: Final answer
    x = 5,544.32

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Double scale
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Similar ratio
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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.