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Finding the Fourth Proportional to 39,879.88, 55,033.94 and 21,974.46

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Solution

The fourth proportional to 39,879.88, 55,033.94 and 21,974.46 is: 30,324.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,879.88 : 55,033.94 = 21,974.46 : x
  2. Step 2: Convert to fraction form
    39,879.88/55,033.94 = 21,974.46/x
  3. Step 3: Cross multiply
    39,879.88x = 55,033.94 × 21,974.46
  4. Step 4: Simplify right side
    39,879.88x = 1,209,341,113.17
  5. Step 5: Solve for x
    x = 1,209,341,113.17/39,879.88
  6. Step 6: Final answer
    x = 30,324.59

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.