Home / 3,928.99-5,421.30-2,883.55

Finding the Fourth Proportional to 3,928.99, 5,421.30 and 2,883.55

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Solution

The fourth proportional to 3,928.99, 5,421.30 and 2,883.55 is: 3,978.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.99 : 5,421.30 = 2,883.55 : x
  2. Step 2: Convert to fraction form
    3,928.99/5,421.30 = 2,883.55/x
  3. Step 3: Cross multiply
    3,928.99x = 5,421.30 × 2,883.55
  4. Step 4: Simplify right side
    3,928.99x = 15,632,589.62
  5. Step 5: Solve for x
    x = 15,632,589.62/3,928.99
  6. Step 6: Final answer
    x = 3,978.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.