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Finding the Fourth Proportional to 127,928.70, 191,893.05 and 85,938.30

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Solution

The fourth proportional to 127,928.70, 191,893.05 and 85,938.30 is: 128,907.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,928.70 : 191,893.05 = 85,938.30 : x
  2. Step 2: Convert to fraction form
    127,928.70/191,893.05 = 85,938.30/x
  3. Step 3: Cross multiply
    127,928.70x = 191,893.05 × 85,938.30
  4. Step 4: Simplify right side
    127,928.70x = 16,490,962,498.82
  5. Step 5: Solve for x
    x = 16,490,962,498.82/127,928.70
  6. Step 6: Final answer
    x = 128,907.45

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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.