Home / 4,991.20-7,480.80-3,431.20

Finding the Fourth Proportional to 4,991.20, 7,480.80 and 3,431.20

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Solution

The fourth proportional to 4,991.20, 7,480.80 and 3,431.20 is: 5,142.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,991.20 : 7,480.80 = 3,431.20 : x
  2. Step 2: Convert to fraction form
    4,991.20/7,480.80 = 3,431.20/x
  3. Step 3: Cross multiply
    4,991.20x = 7,480.80 × 3,431.20
  4. Step 4: Simplify right side
    4,991.20x = 25,668,120.96
  5. Step 5: Solve for x
    x = 25,668,120.96/4,991.20
  6. Step 6: Final answer
    x = 5,142.68

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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.