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Finding the Fourth Proportional to 2,175.78, 3,261.92 and 876

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Solution

The fourth proportional to 2,175.78, 3,261.92 and 876 is: 1,313.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,175.78 : 3,261.92 = 876 : x
  2. Step 2: Convert to fraction form
    2,175.78/3,261.92 = 876/x
  3. Step 3: Cross multiply
    2,175.78x = 3,261.92 × 876
  4. Step 4: Simplify right side
    2,175.78x = 2,857,441.92
  5. Step 5: Solve for x
    x = 2,857,441.92/2,175.78
  6. Step 6: Final answer
    x = 1,313.30

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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.