Home / 2,121.40-3,177.78-1,902.88

Finding the Fourth Proportional to 2,121.40, 3,177.78 and 1,902.88

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Solution

The fourth proportional to 2,121.40, 3,177.78 and 1,902.88 is: 2,850.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.40 : 3,177.78 = 1,902.88 : x
  2. Step 2: Convert to fraction form
    2,121.40/3,177.78 = 1,902.88/x
  3. Step 3: Cross multiply
    2,121.40x = 3,177.78 × 1,902.88
  4. Step 4: Simplify right side
    2,121.40x = 6,046,934.01
  5. Step 5: Solve for x
    x = 6,046,934.01/2,121.40
  6. Step 6: Final answer
    x = 2,850.44

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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.