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Finding the Fourth Proportional to 3,972.70, 5,475.72 and 2,791.72

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Solution

The fourth proportional to 3,972.70, 5,475.72 and 2,791.72 is: 3,847.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,972.70 : 5,475.72 = 2,791.72 : x
  2. Step 2: Convert to fraction form
    3,972.70/5,475.72 = 2,791.72/x
  3. Step 3: Cross multiply
    3,972.70x = 5,475.72 × 2,791.72
  4. Step 4: Simplify right side
    3,972.70x = 15,286,677.04
  5. Step 5: Solve for x
    x = 15,286,677.04/3,972.70
  6. Step 6: Final answer
    x = 3,847.93

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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.