Home / 2,138.28-3,209.20-2,122.08

Finding the Fourth Proportional to 2,138.28, 3,209.20 and 2,122.08

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Solution

The fourth proportional to 2,138.28, 3,209.20 and 2,122.08 is: 3,184.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.28 : 3,209.20 = 2,122.08 : x
  2. Step 2: Convert to fraction form
    2,138.28/3,209.20 = 2,122.08/x
  3. Step 3: Cross multiply
    2,138.28x = 3,209.20 × 2,122.08
  4. Step 4: Simplify right side
    2,138.28x = 6,810,179.14
  5. Step 5: Solve for x
    x = 6,810,179.14/2,138.28
  6. Step 6: Final answer
    x = 3,184.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.