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Finding the Fourth Proportional to 139,194.05, 192,085.12 and 78,763.59

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Solution

The fourth proportional to 139,194.05, 192,085.12 and 78,763.59 is: 108,692.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,194.05 : 192,085.12 = 78,763.59 : x
  2. Step 2: Convert to fraction form
    139,194.05/192,085.12 = 78,763.59/x
  3. Step 3: Cross multiply
    139,194.05x = 192,085.12 × 78,763.59
  4. Step 4: Simplify right side
    139,194.05x = 15,129,313,735.24
  5. Step 5: Solve for x
    x = 15,129,313,735.24/139,194.05
  6. Step 6: Final answer
    x = 108,692.25

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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.