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Finding the Fourth Proportional to 1,961.57, 2,940.30 and 728.42

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Solution

The fourth proportional to 1,961.57, 2,940.30 and 728.42 is: 1,091.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,961.57 : 2,940.30 = 728.42 : x
  2. Step 2: Convert to fraction form
    1,961.57/2,940.30 = 728.42/x
  3. Step 3: Cross multiply
    1,961.57x = 2,940.30 × 728.42
  4. Step 4: Simplify right side
    1,961.57x = 2,141,758.62
  5. Step 5: Solve for x
    x = 2,141,758.62/1,961.57
  6. Step 6: Final answer
    x = 1,091.86

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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.