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Finding the Fourth Proportional to 5,279.97, 7,912.74 and 1,991.27

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Solution

The fourth proportional to 5,279.97, 7,912.74 and 1,991.27 is: 2,984.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,279.97 : 7,912.74 = 1,991.27 : x
  2. Step 2: Convert to fraction form
    5,279.97/7,912.74 = 1,991.27/x
  3. Step 3: Cross multiply
    5,279.97x = 7,912.74 × 1,991.27
  4. Step 4: Simplify right side
    5,279.97x = 15,756,401.78
  5. Step 5: Solve for x
    x = 15,756,401.78/5,279.97
  6. Step 6: Final answer
    x = 2,984.19

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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.