Home / 3,986.57-5,979.85-1,213.56

Finding the Fourth Proportional to 3,986.57, 5,979.85 and 1,213.56

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Solution

The fourth proportional to 3,986.57, 5,979.85 and 1,213.56 is: 1,820.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.57 : 5,979.85 = 1,213.56 : x
  2. Step 2: Convert to fraction form
    3,986.57/5,979.85 = 1,213.56/x
  3. Step 3: Cross multiply
    3,986.57x = 5,979.85 × 1,213.56
  4. Step 4: Simplify right side
    3,986.57x = 7,256,890.33
  5. Step 5: Solve for x
    x = 7,256,890.33/3,986.57
  6. Step 6: Final answer
    x = 1,820.34

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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.