Home / 2,619.20-3,926.80-1,321.60

Finding the Fourth Proportional to 2,619.20, 3,926.80 and 1,321.60

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Solution

The fourth proportional to 2,619.20, 3,926.80 and 1,321.60 is: 1,981.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619.20 : 3,926.80 = 1,321.60 : x
  2. Step 2: Convert to fraction form
    2,619.20/3,926.80 = 1,321.60/x
  3. Step 3: Cross multiply
    2,619.20x = 3,926.80 × 1,321.60
  4. Step 4: Simplify right side
    2,619.20x = 5,189,658.88
  5. Step 5: Solve for x
    x = 5,189,658.88/2,619.20
  6. Step 6: Final answer
    x = 1,981.39

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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.