Home / 2,811.20-4,213.38-1,989.71

Finding the Fourth Proportional to 2,811.20, 4,213.38 and 1,989.71

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Solution

The fourth proportional to 2,811.20, 4,213.38 and 1,989.71 is: 2,982.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.20 : 4,213.38 = 1,989.71 : x
  2. Step 2: Convert to fraction form
    2,811.20/4,213.38 = 1,989.71/x
  3. Step 3: Cross multiply
    2,811.20x = 4,213.38 × 1,989.71
  4. Step 4: Simplify right side
    2,811.20x = 8,383,404.32
  5. Step 5: Solve for x
    x = 8,383,404.32/2,811.20
  6. Step 6: Final answer
    x = 2,982.14

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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.