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Finding the Fourth Proportional to 1,940.51, 2,908.93 and 641.27

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Solution

The fourth proportional to 1,940.51, 2,908.93 and 641.27 is: 961.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.51 : 2,908.93 = 641.27 : x
  2. Step 2: Convert to fraction form
    1,940.51/2,908.93 = 641.27/x
  3. Step 3: Cross multiply
    1,940.51x = 2,908.93 × 641.27
  4. Step 4: Simplify right side
    1,940.51x = 1,865,409.54
  5. Step 5: Solve for x
    x = 1,865,409.54/1,940.51
  6. Step 6: Final answer
    x = 961.30

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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.