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Finding the Fourth Proportional to 2,138.94, 3,208.41 and 984.70

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Solution

The fourth proportional to 2,138.94, 3,208.41 and 984.70 is: 1,477.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.94 : 3,208.41 = 984.70 : x
  2. Step 2: Convert to fraction form
    2,138.94/3,208.41 = 984.70/x
  3. Step 3: Cross multiply
    2,138.94x = 3,208.41 × 984.70
  4. Step 4: Simplify right side
    2,138.94x = 3,159,321.33
  5. Step 5: Solve for x
    x = 3,159,321.33/2,138.94
  6. Step 6: Final answer
    x = 1,477.05

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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.