Home / 3,990.70-5,986.91-1,217.57

Finding the Fourth Proportional to 3,990.70, 5,986.91 and 1,217.57

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Solution

The fourth proportional to 3,990.70, 5,986.91 and 1,217.57 is: 1,826.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.70 : 5,986.91 = 1,217.57 : x
  2. Step 2: Convert to fraction form
    3,990.70/5,986.91 = 1,217.57/x
  3. Step 3: Cross multiply
    3,990.70x = 5,986.91 × 1,217.57
  4. Step 4: Simplify right side
    3,990.70x = 7,289,455.12
  5. Step 5: Solve for x
    x = 7,289,455.12/3,990.70
  6. Step 6: Final answer
    x = 1,826.61

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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.