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Finding the Fourth Proportional to 1,941.87, 2,912.36 and 771.37

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Solution

The fourth proportional to 1,941.87, 2,912.36 and 771.37 is: 1,156.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,941.87 : 2,912.36 = 771.37 : x
  2. Step 2: Convert to fraction form
    1,941.87/2,912.36 = 771.37/x
  3. Step 3: Cross multiply
    1,941.87x = 2,912.36 × 771.37
  4. Step 4: Simplify right side
    1,941.87x = 2,246,512.38
  5. Step 5: Solve for x
    x = 2,246,512.38/1,941.87
  6. Step 6: Final answer
    x = 1,156.88

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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.