Home / 3,990.72-5,986.34-1,217.60

Finding the Fourth Proportional to 3,990.72, 5,986.34 and 1,217.60

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Solution

The fourth proportional to 3,990.72, 5,986.34 and 1,217.60 is: 1,826.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.72 : 5,986.34 = 1,217.60 : x
  2. Step 2: Convert to fraction form
    3,990.72/5,986.34 = 1,217.60/x
  3. Step 3: Cross multiply
    3,990.72x = 5,986.34 × 1,217.60
  4. Step 4: Simplify right side
    3,990.72x = 7,288,967.58
  5. Step 5: Solve for x
    x = 7,288,967.58/3,990.72
  6. Step 6: Final answer
    x = 1,826.48

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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.