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Finding the Fourth Proportional to 1,961.44, 2,940.30 and 728.01

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Solution

The fourth proportional to 1,961.44, 2,940.30 and 728.01 is: 1,091.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,961.44 : 2,940.30 = 728.01 : x
  2. Step 2: Convert to fraction form
    1,961.44/2,940.30 = 728.01/x
  3. Step 3: Cross multiply
    1,961.44x = 2,940.30 × 728.01
  4. Step 4: Simplify right side
    1,961.44x = 2,140,564.16
  5. Step 5: Solve for x
    x = 2,140,564.16/1,961.44
  6. Step 6: Final answer
    x = 1,091.33

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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.