Home / 1,990.22-2,986.87-1,378.21

Finding the Fourth Proportional to 1,990.22, 2,986.87 and 1,378.21

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Solution

The fourth proportional to 1,990.22, 2,986.87 and 1,378.21 is: 2,068.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.22 : 2,986.87 = 1,378.21 : x
  2. Step 2: Convert to fraction form
    1,990.22/2,986.87 = 1,378.21/x
  3. Step 3: Cross multiply
    1,990.22x = 2,986.87 × 1,378.21
  4. Step 4: Simplify right side
    1,990.22x = 4,116,523.19
  5. Step 5: Solve for x
    x = 4,116,523.19/1,990.22
  6. Step 6: Final answer
    x = 2,068.38

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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.