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Finding the Fourth Proportional to 128,806.30, 193,172.53 and 43,407.85

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Solution

The fourth proportional to 128,806.30, 193,172.53 and 43,407.85 is: 65,099.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,806.30 : 193,172.53 = 43,407.85 : x
  2. Step 2: Convert to fraction form
    128,806.30/193,172.53 = 43,407.85/x
  3. Step 3: Cross multiply
    128,806.30x = 193,172.53 × 43,407.85
  4. Step 4: Simplify right side
    128,806.30x = 8,385,204,206.36
  5. Step 5: Solve for x
    x = 8,385,204,206.36/128,806.30
  6. Step 6: Final answer
    x = 65,099.33

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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.