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Finding the Fourth Proportional to 3,279.78, 4,918.20 and 1,057.92

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Solution

The fourth proportional to 3,279.78, 4,918.20 and 1,057.92 is: 1,586.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,279.78 : 4,918.20 = 1,057.92 : x
  2. Step 2: Convert to fraction form
    3,279.78/4,918.20 = 1,057.92/x
  3. Step 3: Cross multiply
    3,279.78x = 4,918.20 × 1,057.92
  4. Step 4: Simplify right side
    3,279.78x = 5,203,062.14
  5. Step 5: Solve for x
    x = 5,203,062.14/3,279.78
  6. Step 6: Final answer
    x = 1,586.41

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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.