Home / 5,418.78-8,128.56-2,647.76

Finding the Fourth Proportional to 5,418.78, 8,128.56 and 2,647.76

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Solution

The fourth proportional to 5,418.78, 8,128.56 and 2,647.76 is: 3,971.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,418.78 : 8,128.56 = 2,647.76 : x
  2. Step 2: Convert to fraction form
    5,418.78/8,128.56 = 2,647.76/x
  3. Step 3: Cross multiply
    5,418.78x = 8,128.56 × 2,647.76
  4. Step 4: Simplify right side
    5,418.78x = 21,522,476.03
  5. Step 5: Solve for x
    x = 21,522,476.03/5,418.78
  6. Step 6: Final answer
    x = 3,971.83

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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.