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Finding the Fourth Proportional to 3,936.40, 5,906.40 and 1,855.60

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Solution

The fourth proportional to 3,936.40, 5,906.40 and 1,855.60 is: 2,784.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,936.40 : 5,906.40 = 1,855.60 : x
  2. Step 2: Convert to fraction form
    3,936.40/5,906.40 = 1,855.60/x
  3. Step 3: Cross multiply
    3,936.40x = 5,906.40 × 1,855.60
  4. Step 4: Simplify right side
    3,936.40x = 10,959,915.84
  5. Step 5: Solve for x
    x = 10,959,915.84/3,936.40
  6. Step 6: Final answer
    x = 2,784.25

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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.