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Finding the Fourth Proportional to 39,784.82, 54,901.77 and 21,879.77

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Solution

The fourth proportional to 39,784.82, 54,901.77 and 21,879.77 is: 30,193.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,784.82 : 54,901.77 = 21,879.77 : x
  2. Step 2: Convert to fraction form
    39,784.82/54,901.77 = 21,879.77/x
  3. Step 3: Cross multiply
    39,784.82x = 54,901.77 × 21,879.77
  4. Step 4: Simplify right side
    39,784.82x = 1,201,237,825.68
  5. Step 5: Solve for x
    x = 1,201,237,825.68/39,784.82
  6. Step 6: Final answer
    x = 30,193.37

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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.