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Finding the Fourth Proportional to 128,896.50, 193,344.75 and 45,793.78

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Solution

The fourth proportional to 128,896.50, 193,344.75 and 45,793.78 is: 68,690.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,896.50 : 193,344.75 = 45,793.78 : x
  2. Step 2: Convert to fraction form
    128,896.50/193,344.75 = 45,793.78/x
  3. Step 3: Cross multiply
    128,896.50x = 193,344.75 × 45,793.78
  4. Step 4: Simplify right side
    128,896.50x = 8,853,986,945.66
  5. Step 5: Solve for x
    x = 8,853,986,945.66/128,896.50
  6. Step 6: Final answer
    x = 68,690.67

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.