Home / 2,811.21-4,212.71-1,989.03

Finding the Fourth Proportional to 2,811.21, 4,212.71 and 1,989.03

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Solution

The fourth proportional to 2,811.21, 4,212.71 and 1,989.03 is: 2,980.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.21 : 4,212.71 = 1,989.03 : x
  2. Step 2: Convert to fraction form
    2,811.21/4,212.71 = 1,989.03/x
  3. Step 3: Cross multiply
    2,811.21x = 4,212.71 × 1,989.03
  4. Step 4: Simplify right side
    2,811.21x = 8,379,208.03
  5. Step 5: Solve for x
    x = 8,379,208.03/2,811.21
  6. Step 6: Final answer
    x = 2,980.65

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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.