Home / 3,991.20-5,986.80-3,764.40

Finding the Fourth Proportional to 3,991.20, 5,986.80 and 3,764.40

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Solution

The fourth proportional to 3,991.20, 5,986.80 and 3,764.40 is: 5,646.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,991.20 : 5,986.80 = 3,764.40 : x
  2. Step 2: Convert to fraction form
    3,991.20/5,986.80 = 3,764.40/x
  3. Step 3: Cross multiply
    3,991.20x = 5,986.80 × 3,764.40
  4. Step 4: Simplify right side
    3,991.20x = 22,536,709.92
  5. Step 5: Solve for x
    x = 22,536,709.92/3,991.20
  6. Step 6: Final answer
    x = 5,646.60

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1.5x scale

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.