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Finding the Fourth Proportional to 128,989.98, 193,540.41 and 66,704.22

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Solution

The fourth proportional to 128,989.98, 193,540.41 and 66,704.22 is: 100,085.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,989.98 : 193,540.41 = 66,704.22 : x
  2. Step 2: Convert to fraction form
    128,989.98/193,540.41 = 66,704.22/x
  3. Step 3: Cross multiply
    128,989.98x = 193,540.41 × 66,704.22
  4. Step 4: Simplify right side
    128,989.98x = 12,909,962,087.53
  5. Step 5: Solve for x
    x = 12,909,962,087.53/128,989.98
  6. Step 6: Final answer
    x = 100,085.00

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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.