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Finding the Fourth Proportional to 128,391.27, 177,204.27 and 86,023.41

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Solution

The fourth proportional to 128,391.27, 177,204.27 and 86,023.41 is: 118,728.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,391.27 : 177,204.27 = 86,023.41 : x
  2. Step 2: Convert to fraction form
    128,391.27/177,204.27 = 86,023.41/x
  3. Step 3: Cross multiply
    128,391.27x = 177,204.27 × 86,023.41
  4. Step 4: Simplify right side
    128,391.27x = 15,243,715,571.96
  5. Step 5: Solve for x
    x = 15,243,715,571.96/128,391.27
  6. Step 6: Final answer
    x = 118,728.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.