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Finding the Fourth Proportional to 353,790.99, 530,213.55 and 128,940.05

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Solution

The fourth proportional to 353,790.99, 530,213.55 and 128,940.05 is: 193,237.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    353,790.99 : 530,213.55 = 128,940.05 : x
  2. Step 2: Convert to fraction form
    353,790.99/530,213.55 = 128,940.05/x
  3. Step 3: Cross multiply
    353,790.99x = 530,213.55 × 128,940.05
  4. Step 4: Simplify right side
    353,790.99x = 68,365,762,489.69
  5. Step 5: Solve for x
    x = 68,365,762,489.69/353,790.99
  6. Step 6: Final answer
    x = 193,237.71

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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.