Home / 3,936.21-5,431.95-2,167.78

Finding the Fourth Proportional to 3,936.21, 5,431.95 and 2,167.78

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Solution

The fourth proportional to 3,936.21, 5,431.95 and 2,167.78 is: 2,991.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,936.21 : 5,431.95 = 2,167.78 : x
  2. Step 2: Convert to fraction form
    3,936.21/5,431.95 = 2,167.78/x
  3. Step 3: Cross multiply
    3,936.21x = 5,431.95 × 2,167.78
  4. Step 4: Simplify right side
    3,936.21x = 11,775,272.57
  5. Step 5: Solve for x
    x = 11,775,272.57/3,936.21
  6. Step 6: Final answer
    x = 2,991.53

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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.