Home / 3,890.11-5,368.39-2,121.75

Finding the Fourth Proportional to 3,890.11, 5,368.39 and 2,121.75

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Solution

The fourth proportional to 3,890.11, 5,368.39 and 2,121.75 is: 2,928.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.11 : 5,368.39 = 2,121.75 : x
  2. Step 2: Convert to fraction form
    3,890.11/5,368.39 = 2,121.75/x
  3. Step 3: Cross multiply
    3,890.11x = 5,368.39 × 2,121.75
  4. Step 4: Simplify right side
    3,890.11x = 11,390,394.26
  5. Step 5: Solve for x
    x = 11,390,394.26/3,890.11
  6. Step 6: Final answer
    x = 2,928.04

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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.