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Finding the Fourth Proportional to 128,990.98, 193,541.91 and 66,705.22

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Solution

The fourth proportional to 128,990.98, 193,541.91 and 66,705.22 is: 100,086.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,990.98 : 193,541.91 = 66,705.22 : x
  2. Step 2: Convert to fraction form
    128,990.98/193,541.91 = 66,705.22/x
  3. Step 3: Cross multiply
    128,990.98x = 193,541.91 × 66,705.22
  4. Step 4: Simplify right side
    128,990.98x = 12,910,255,685.77
  5. Step 5: Solve for x
    x = 12,910,255,685.77/128,990.98
  6. Step 6: Final answer
    x = 100,086.50

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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.