Home / 3,940.78-5,911.26-1,307.44

Finding the Fourth Proportional to 3,940.78, 5,911.26 and 1,307.44

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Solution

The fourth proportional to 3,940.78, 5,911.26 and 1,307.44 is: 1,961.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.78 : 5,911.26 = 1,307.44 : x
  2. Step 2: Convert to fraction form
    3,940.78/5,911.26 = 1,307.44/x
  3. Step 3: Cross multiply
    3,940.78x = 5,911.26 × 1,307.44
  4. Step 4: Simplify right side
    3,940.78x = 7,728,617.77
  5. Step 5: Solve for x
    x = 7,728,617.77/3,940.78
  6. Step 6: Final answer
    x = 1,961.19

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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.