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Finding the Fourth Proportional to 128,963.61, 193,416.46 and 54,168.21

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Solution

The fourth proportional to 128,963.61, 193,416.46 and 54,168.21 is: 81,240.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,963.61 : 193,416.46 = 54,168.21 : x
  2. Step 2: Convert to fraction form
    128,963.61/193,416.46 = 54,168.21/x
  3. Step 3: Cross multiply
    128,963.61x = 193,416.46 × 54,168.21
  4. Step 4: Simplify right side
    128,963.61x = 10,477,023,287.32
  5. Step 5: Solve for x
    x = 10,477,023,287.32/128,963.61
  6. Step 6: Final answer
    x = 81,240.15

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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.