Home / 3,890.69-5,369.11-2,122.19

Finding the Fourth Proportional to 3,890.69, 5,369.11 and 2,122.19

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Solution

The fourth proportional to 3,890.69, 5,369.11 and 2,122.19 is: 2,928.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.69 : 5,369.11 = 2,122.19 : x
  2. Step 2: Convert to fraction form
    3,890.69/5,369.11 = 2,122.19/x
  3. Step 3: Cross multiply
    3,890.69x = 5,369.11 × 2,122.19
  4. Step 4: Simplify right side
    3,890.69x = 11,394,239.40
  5. Step 5: Solve for x
    x = 11,394,239.40/3,890.69
  6. Step 6: Final answer
    x = 2,928.59

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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.