Home / 3,940.65-5,911.92-1,309.05

Finding the Fourth Proportional to 3,940.65, 5,911.92 and 1,309.05

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Solution

The fourth proportional to 3,940.65, 5,911.92 and 1,309.05 is: 1,963.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.65 : 5,911.92 = 1,309.05 : x
  2. Step 2: Convert to fraction form
    3,940.65/5,911.92 = 1,309.05/x
  3. Step 3: Cross multiply
    3,940.65x = 5,911.92 × 1,309.05
  4. Step 4: Simplify right side
    3,940.65x = 7,738,998.88
  5. Step 5: Solve for x
    x = 7,738,998.88/3,940.65
  6. Step 6: Final answer
    x = 1,963.89

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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.