Home / 3,890.28-5,368.60-2,121.88

Finding the Fourth Proportional to 3,890.28, 5,368.60 and 2,121.88

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Solution

The fourth proportional to 3,890.28, 5,368.60 and 2,121.88 is: 2,928.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.28 : 5,368.60 = 2,121.88 : x
  2. Step 2: Convert to fraction form
    3,890.28/5,368.60 = 2,121.88/x
  3. Step 3: Cross multiply
    3,890.28x = 5,368.60 × 2,121.88
  4. Step 4: Simplify right side
    3,890.28x = 11,391,524.97
  5. Step 5: Solve for x
    x = 11,391,524.97/3,890.28
  6. Step 6: Final answer
    x = 2,928.20

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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.