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Finding the Fourth Proportional to 2,640.11, 3,961.12 and 1,235.76

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Solution

The fourth proportional to 2,640.11, 3,961.12 and 1,235.76 is: 1,854.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.11 : 3,961.12 = 1,235.76 : x
  2. Step 2: Convert to fraction form
    2,640.11/3,961.12 = 1,235.76/x
  3. Step 3: Cross multiply
    2,640.11x = 3,961.12 × 1,235.76
  4. Step 4: Simplify right side
    2,640.11x = 4,894,993.65
  5. Step 5: Solve for x
    x = 4,894,993.65/2,640.11
  6. Step 6: Final answer
    x = 1,854.09

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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.