Home / 3,986.60-5,979.21-1,212.60

Finding the Fourth Proportional to 3,986.60, 5,979.21 and 1,212.60

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Solution

The fourth proportional to 3,986.60, 5,979.21 and 1,212.60 is: 1,818.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.60 : 5,979.21 = 1,212.60 : x
  2. Step 2: Convert to fraction form
    3,986.60/5,979.21 = 1,212.60/x
  3. Step 3: Cross multiply
    3,986.60x = 5,979.21 × 1,212.60
  4. Step 4: Simplify right side
    3,986.60x = 7,250,390.05
  5. Step 5: Solve for x
    x = 7,250,390.05/3,986.60
  6. Step 6: Final answer
    x = 1,818.69

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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.