Home / 2,621.76-3,929.76-1,321.44

Finding the Fourth Proportional to 2,621.76, 3,929.76 and 1,321.44

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Solution

The fourth proportional to 2,621.76, 3,929.76 and 1,321.44 is: 1,980.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,621.76 : 3,929.76 = 1,321.44 : x
  2. Step 2: Convert to fraction form
    2,621.76/3,929.76 = 1,321.44/x
  3. Step 3: Cross multiply
    2,621.76x = 3,929.76 × 1,321.44
  4. Step 4: Simplify right side
    2,621.76x = 5,192,942.05
  5. Step 5: Solve for x
    x = 5,192,942.05/2,621.76
  6. Step 6: Final answer
    x = 1,980.71

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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.