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Finding the Fourth Proportional to 11,879.79, 17,820.26 and 3,114.71

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Solution

The fourth proportional to 11,879.79, 17,820.26 and 3,114.71 is: 4,672.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,879.79 : 17,820.26 = 3,114.71 : x
  2. Step 2: Convert to fraction form
    11,879.79/17,820.26 = 3,114.71/x
  3. Step 3: Cross multiply
    11,879.79x = 17,820.26 × 3,114.71
  4. Step 4: Simplify right side
    11,879.79x = 55,504,942.02
  5. Step 5: Solve for x
    x = 55,504,942.02/11,879.79
  6. Step 6: Final answer
    x = 4,672.22

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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.