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Finding the Fourth Proportional to 127,989.70, 191,984.55 and 85,999.30

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Solution

The fourth proportional to 127,989.70, 191,984.55 and 85,999.30 is: 128,998.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,989.70 : 191,984.55 = 85,999.30 : x
  2. Step 2: Convert to fraction form
    127,989.70/191,984.55 = 85,999.30/x
  3. Step 3: Cross multiply
    127,989.70x = 191,984.55 × 85,999.30
  4. Step 4: Simplify right side
    127,989.70x = 16,510,536,910.82
  5. Step 5: Solve for x
    x = 16,510,536,910.82/127,989.70
  6. Step 6: Final answer
    x = 128,998.95

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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.