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Finding the Fourth Proportional to 1,961.22, 2,940.01 and 661.78

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Solution

The fourth proportional to 1,961.22, 2,940.01 and 661.78 is: 992.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,961.22 : 2,940.01 = 661.78 : x
  2. Step 2: Convert to fraction form
    1,961.22/2,940.01 = 661.78/x
  3. Step 3: Cross multiply
    1,961.22x = 2,940.01 × 661.78
  4. Step 4: Simplify right side
    1,961.22x = 1,945,641.84
  5. Step 5: Solve for x
    x = 1,945,641.84/1,961.22
  6. Step 6: Final answer
    x = 992.06

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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.