Home / 1,990.21-2,764.50-1,958.43

Finding the Fourth Proportional to 1,990.21, 2,764.50 and 1,958.43

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Solution

The fourth proportional to 1,990.21, 2,764.50 and 1,958.43 is: 2,720.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.21 : 2,764.50 = 1,958.43 : x
  2. Step 2: Convert to fraction form
    1,990.21/2,764.50 = 1,958.43/x
  3. Step 3: Cross multiply
    1,990.21x = 2,764.50 × 1,958.43
  4. Step 4: Simplify right side
    1,990.21x = 5,414,069.94
  5. Step 5: Solve for x
    x = 5,414,069.94/1,990.21
  6. Step 6: Final answer
    x = 2,720.35

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.