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Finding the Fourth Proportional to 1,940.14, 2,909.67 and 641.44

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Solution

The fourth proportional to 1,940.14, 2,909.67 and 641.44 is: 961.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.14 : 2,909.67 = 641.44 : x
  2. Step 2: Convert to fraction form
    1,940.14/2,909.67 = 641.44/x
  3. Step 3: Cross multiply
    1,940.14x = 2,909.67 × 641.44
  4. Step 4: Simplify right side
    1,940.14x = 1,866,378.72
  5. Step 5: Solve for x
    x = 1,866,378.72/1,940.14
  6. Step 6: Final answer
    x = 961.98

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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.