Home / 2,811.19-4,213.37-1,989.70

Finding the Fourth Proportional to 2,811.19, 4,213.37 and 1,989.70

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Solution

The fourth proportional to 2,811.19, 4,213.37 and 1,989.70 is: 2,982.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.19 : 4,213.37 = 1,989.70 : x
  2. Step 2: Convert to fraction form
    2,811.19/4,213.37 = 1,989.70/x
  3. Step 3: Cross multiply
    2,811.19x = 4,213.37 × 1,989.70
  4. Step 4: Simplify right side
    2,811.19x = 8,383,342.29
  5. Step 5: Solve for x
    x = 8,383,342.29/2,811.19
  6. Step 6: Final answer
    x = 2,982.13

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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.