Home / 3,278.78-4,920.19-1,331

Finding the Fourth Proportional to 3,278.78, 4,920.19 and 1,331

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Solution

The fourth proportional to 3,278.78, 4,920.19 and 1,331 is: 1,997.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,278.78 : 4,920.19 = 1,331 : x
  2. Step 2: Convert to fraction form
    3,278.78/4,920.19 = 1,331/x
  3. Step 3: Cross multiply
    3,278.78x = 4,920.19 × 1,331
  4. Step 4: Simplify right side
    3,278.78x = 6,548,772.89
  5. Step 5: Solve for x
    x = 6,548,772.89/3,278.78
  6. Step 6: Final answer
    x = 1,997.32

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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.