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Finding the Fourth Proportional to 1,786.20, 2,679.94 and 798.92

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Solution

The fourth proportional to 1,786.20, 2,679.94 and 798.92 is: 1,198.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.20 : 2,679.94 = 798.92 : x
  2. Step 2: Convert to fraction form
    1,786.20/2,679.94 = 798.92/x
  3. Step 3: Cross multiply
    1,786.20x = 2,679.94 × 798.92
  4. Step 4: Simplify right side
    1,786.20x = 2,141,057.66
  5. Step 5: Solve for x
    x = 2,141,057.66/1,786.20
  6. Step 6: Final answer
    x = 1,198.67

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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.