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Finding the Fourth Proportional to 39,879.82, 55,036.60 and 21,974.82

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Solution

The fourth proportional to 39,879.82, 55,036.60 and 21,974.82 is: 30,326.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,879.82 : 55,036.60 = 21,974.82 : x
  2. Step 2: Convert to fraction form
    39,879.82/55,036.60 = 21,974.82/x
  3. Step 3: Cross multiply
    39,879.82x = 55,036.60 × 21,974.82
  4. Step 4: Simplify right side
    39,879.82x = 1,209,419,378.41
  5. Step 5: Solve for x
    x = 1,209,419,378.41/39,879.82
  6. Step 6: Final answer
    x = 30,326.60

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1.5x scale

Why These Related Problems?

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