Home / 3,890.20-5,368.50-2,121.84

Finding the Fourth Proportional to 3,890.20, 5,368.50 and 2,121.84

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Solution

The fourth proportional to 3,890.20, 5,368.50 and 2,121.84 is: 2,928.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.20 : 5,368.50 = 2,121.84 : x
  2. Step 2: Convert to fraction form
    3,890.20/5,368.50 = 2,121.84/x
  3. Step 3: Cross multiply
    3,890.20x = 5,368.50 × 2,121.84
  4. Step 4: Simplify right side
    3,890.20x = 11,391,098.04
  5. Step 5: Solve for x
    x = 11,391,098.04/3,890.20
  6. Step 6: Final answer
    x = 2,928.15

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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.