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Finding the Fourth Proportional to 1,961.70, 2,941.89 and 791.40

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Solution

The fourth proportional to 1,961.70, 2,941.89 and 791.40 is: 1,186.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,961.70 : 2,941.89 = 791.40 : x
  2. Step 2: Convert to fraction form
    1,961.70/2,941.89 = 791.40/x
  3. Step 3: Cross multiply
    1,961.70x = 2,941.89 × 791.40
  4. Step 4: Simplify right side
    1,961.70x = 2,328,211.75
  5. Step 5: Solve for x
    x = 2,328,211.75/1,961.70
  6. Step 6: Final answer
    x = 1,186.83

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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.