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Finding the Fourth Proportional to 11,919.77, 17,879.67 and 4,128.59

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Solution

The fourth proportional to 11,919.77, 17,879.67 and 4,128.59 is: 6,192.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,919.77 : 17,879.67 = 4,128.59 : x
  2. Step 2: Convert to fraction form
    11,919.77/17,879.67 = 4,128.59/x
  3. Step 3: Cross multiply
    11,919.77x = 17,879.67 × 4,128.59
  4. Step 4: Simplify right side
    11,919.77x = 73,817,737.37
  5. Step 5: Solve for x
    x = 73,817,737.37/11,919.77
  6. Step 6: Final answer
    x = 6,192.88

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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.