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Finding the Fourth Proportional to 39,692.80, 54,776.69 and 21,789.44

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Solution

The fourth proportional to 39,692.80, 54,776.69 and 21,789.44 is: 30,069.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,692.80 : 54,776.69 = 21,789.44 : x
  2. Step 2: Convert to fraction form
    39,692.80/54,776.69 = 21,789.44/x
  3. Step 3: Cross multiply
    39,692.80x = 54,776.69 × 21,789.44
  4. Step 4: Simplify right side
    39,692.80x = 1,193,553,291.21
  5. Step 5: Solve for x
    x = 1,193,553,291.21/39,692.80
  6. Step 6: Final answer
    x = 30,069.77

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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.