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Finding the Fourth Proportional to 643,811.70, 965,717.55 and 194,601.90

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Solution

The fourth proportional to 643,811.70, 965,717.55 and 194,601.90 is: 291,902.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,811.70 : 965,717.55 = 194,601.90 : x
  2. Step 2: Convert to fraction form
    643,811.70/965,717.55 = 194,601.90/x
  3. Step 3: Cross multiply
    643,811.70x = 965,717.55 × 194,601.90
  4. Step 4: Simplify right side
    643,811.70x = 187,930,470,093.35
  5. Step 5: Solve for x
    x = 187,930,470,093.35/643,811.70
  6. Step 6: Final answer
    x = 291,902.85

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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.