Home / 1,939.21-2,908.41-640.38

Finding the Fourth Proportional to 1,939.21, 2,908.41 and 640.38

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Solution

The fourth proportional to 1,939.21, 2,908.41 and 640.38 is: 960.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.21 : 2,908.41 = 640.38 : x
  2. Step 2: Convert to fraction form
    1,939.21/2,908.41 = 640.38/x
  3. Step 3: Cross multiply
    1,939.21x = 2,908.41 × 640.38
  4. Step 4: Simplify right side
    1,939.21x = 1,862,487.60
  5. Step 5: Solve for x
    x = 1,862,487.60/1,939.21
  6. Step 6: Final answer
    x = 960.44

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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.