Home / 3,890.12-5,368.43-2,121.78

Finding the Fourth Proportional to 3,890.12, 5,368.43 and 2,121.78

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Solution

The fourth proportional to 3,890.12, 5,368.43 and 2,121.78 is: 2,928.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.12 : 5,368.43 = 2,121.78 : x
  2. Step 2: Convert to fraction form
    3,890.12/5,368.43 = 2,121.78/x
  3. Step 3: Cross multiply
    3,890.12x = 5,368.43 × 2,121.78
  4. Step 4: Simplify right side
    3,890.12x = 11,390,616.80
  5. Step 5: Solve for x
    x = 11,390,616.80/3,890.12
  6. Step 6: Final answer
    x = 2,928.09

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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.