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Finding the Fourth Proportional to 7,978.23, 11,969.37 and 3,047.36

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Solution

The fourth proportional to 7,978.23, 11,969.37 and 3,047.36 is: 4,571.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,978.23 : 11,969.37 = 3,047.36 : x
  2. Step 2: Convert to fraction form
    7,978.23/11,969.37 = 3,047.36/x
  3. Step 3: Cross multiply
    7,978.23x = 11,969.37 × 3,047.36
  4. Step 4: Simplify right side
    7,978.23x = 36,474,919.52
  5. Step 5: Solve for x
    x = 36,474,919.52/7,978.23
  6. Step 6: Final answer
    x = 4,571.81

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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.