Home / 3,890.80-5,369.27-2,122.39

Finding the Fourth Proportional to 3,890.80, 5,369.27 and 2,122.39

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Solution

The fourth proportional to 3,890.80, 5,369.27 and 2,122.39 is: 2,928.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.80 : 5,369.27 = 2,122.39 : x
  2. Step 2: Convert to fraction form
    3,890.80/5,369.27 = 2,122.39/x
  3. Step 3: Cross multiply
    3,890.80x = 5,369.27 × 2,122.39
  4. Step 4: Simplify right side
    3,890.80x = 11,395,684.96
  5. Step 5: Solve for x
    x = 11,395,684.96/3,890.80
  6. Step 6: Final answer
    x = 2,928.88

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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.