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Finding the Fourth Proportional to 2,680.78, 4,020.36 and 949

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Solution

The fourth proportional to 2,680.78, 4,020.36 and 949 is: 1,423.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,680.78 : 4,020.36 = 949 : x
  2. Step 2: Convert to fraction form
    2,680.78/4,020.36 = 949/x
  3. Step 3: Cross multiply
    2,680.78x = 4,020.36 × 949
  4. Step 4: Simplify right side
    2,680.78x = 3,815,321.64
  5. Step 5: Solve for x
    x = 3,815,321.64/2,680.78
  6. Step 6: Final answer
    x = 1,423.21

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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.