Home / 2,811.45-4,218.03-1,991.31

Finding the Fourth Proportional to 2,811.45, 4,218.03 and 1,991.31

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Solution

The fourth proportional to 2,811.45, 4,218.03 and 1,991.31 is: 2,987.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.45 : 4,218.03 = 1,991.31 : x
  2. Step 2: Convert to fraction form
    2,811.45/4,218.03 = 1,991.31/x
  3. Step 3: Cross multiply
    2,811.45x = 4,218.03 × 1,991.31
  4. Step 4: Simplify right side
    2,811.45x = 8,399,405.32
  5. Step 5: Solve for x
    x = 8,399,405.32/2,811.45
  6. Step 6: Final answer
    x = 2,987.57

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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.