Home / 2,639.78-3,959.64-1,100.78

Finding the Fourth Proportional to 2,639.78, 3,959.64 and 1,100.78

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Solution

The fourth proportional to 2,639.78, 3,959.64 and 1,100.78 is: 1,651.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.78 : 3,959.64 = 1,100.78 : x
  2. Step 2: Convert to fraction form
    2,639.78/3,959.64 = 1,100.78/x
  3. Step 3: Cross multiply
    2,639.78x = 3,959.64 × 1,100.78
  4. Step 4: Simplify right side
    2,639.78x = 4,358,692.52
  5. Step 5: Solve for x
    x = 4,358,692.52/2,639.78
  6. Step 6: Final answer
    x = 1,651.16

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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.