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Finding the Fourth Proportional to 1,939.73, 2,910.20 and 642.11

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Solution

The fourth proportional to 1,939.73, 2,910.20 and 642.11 is: 963.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.73 : 2,910.20 = 642.11 : x
  2. Step 2: Convert to fraction form
    1,939.73/2,910.20 = 642.11/x
  3. Step 3: Cross multiply
    1,939.73x = 2,910.20 × 642.11
  4. Step 4: Simplify right side
    1,939.73x = 1,868,668.52
  5. Step 5: Solve for x
    x = 1,868,668.52/1,939.73
  6. Step 6: Final answer
    x = 963.37

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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.