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Finding the Fourth Proportional to 127,912.80, 191,955.60 and 83,431.20

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Solution

The fourth proportional to 127,912.80, 191,955.60 and 83,431.20 is: 125,203.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,912.80 : 191,955.60 = 83,431.20 : x
  2. Step 2: Convert to fraction form
    127,912.80/191,955.60 = 83,431.20/x
  3. Step 3: Cross multiply
    127,912.80x = 191,955.60 × 83,431.20
  4. Step 4: Simplify right side
    127,912.80x = 16,015,086,054.72
  5. Step 5: Solve for x
    x = 16,015,086,054.72/127,912.80
  6. Step 6: Final answer
    x = 125,203.15

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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.