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Finding the Fourth Proportional to 127,930.70, 191,896.05 and 85,940.30

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Solution

The fourth proportional to 127,930.70, 191,896.05 and 85,940.30 is: 128,910.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,930.70 : 191,896.05 = 85,940.30 : x
  2. Step 2: Convert to fraction form
    127,930.70/191,896.05 = 85,940.30/x
  3. Step 3: Cross multiply
    127,930.70x = 191,896.05 × 85,940.30
  4. Step 4: Simplify right side
    127,930.70x = 16,491,604,105.82
  5. Step 5: Solve for x
    x = 16,491,604,105.82/127,930.70
  6. Step 6: Final answer
    x = 128,910.45

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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.