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Finding the Fourth Proportional to 3,600, 5,372.16 and 3,211.20

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Solution

The fourth proportional to 3,600, 5,372.16 and 3,211.20 is: 4,791.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,600 : 5,372.16 = 3,211.20 : x
  2. Step 2: Convert to fraction form
    3,600/5,372.16 = 3,211.20/x
  3. Step 3: Cross multiply
    3,600x = 5,372.16 × 3,211.20
  4. Step 4: Simplify right side
    3,600x = 17,251,080.19
  5. Step 5: Solve for x
    x = 17,251,080.19/3,600
  6. Step 6: Final answer
    x = 4,791.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.