Home / 2,190.18-3,278.79-1,321.86

Finding the Fourth Proportional to 2,190.18, 3,278.79 and 1,321.86

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Solution

The fourth proportional to 2,190.18, 3,278.79 and 1,321.86 is: 1,978.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,190.18 : 3,278.79 = 1,321.86 : x
  2. Step 2: Convert to fraction form
    2,190.18/3,278.79 = 1,321.86/x
  3. Step 3: Cross multiply
    2,190.18x = 3,278.79 × 1,321.86
  4. Step 4: Simplify right side
    2,190.18x = 4,334,101.35
  5. Step 5: Solve for x
    x = 4,334,101.35/2,190.18
  6. Step 6: Final answer
    x = 1,978.88

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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.