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Finding the Fourth Proportional to 3,936, 5,431.74 and 2,167.77

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Solution

The fourth proportional to 3,936, 5,431.74 and 2,167.77 is: 2,991.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,936 : 5,431.74 = 2,167.77 : x
  2. Step 2: Convert to fraction form
    3,936/5,431.74 = 2,167.77/x
  3. Step 3: Cross multiply
    3,936x = 5,431.74 × 2,167.77
  4. Step 4: Simplify right side
    3,936x = 11,774,763.02
  5. Step 5: Solve for x
    x = 11,774,763.02/3,936
  6. Step 6: Final answer
    x = 2,991.56

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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.