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Finding the Fourth Proportional to 1,938.94, 2,908.91 and 640.41

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Solution

The fourth proportional to 1,938.94, 2,908.91 and 640.41 is: 960.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.94 : 2,908.91 = 640.41 : x
  2. Step 2: Convert to fraction form
    1,938.94/2,908.91 = 640.41/x
  3. Step 3: Cross multiply
    1,938.94x = 2,908.91 × 640.41
  4. Step 4: Simplify right side
    1,938.94x = 1,862,885.75
  5. Step 5: Solve for x
    x = 1,862,885.75/1,938.94
  6. Step 6: Final answer
    x = 960.78

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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.