Home / 2,121.42-3,179.04-1,860.78

Finding the Fourth Proportional to 2,121.42, 3,179.04 and 1,860.78

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Solution

The fourth proportional to 2,121.42, 3,179.04 and 1,860.78 is: 2,788.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.42 : 3,179.04 = 1,860.78 : x
  2. Step 2: Convert to fraction form
    2,121.42/3,179.04 = 1,860.78/x
  3. Step 3: Cross multiply
    2,121.42x = 3,179.04 × 1,860.78
  4. Step 4: Simplify right side
    2,121.42x = 5,915,494.05
  5. Step 5: Solve for x
    x = 5,915,494.05/2,121.42
  6. Step 6: Final answer
    x = 2,788.46

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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.