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Finding the Fourth Proportional to 128,381.60, 192,207.90 and 121,399.40

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Solution

The fourth proportional to 128,381.60, 192,207.90 and 121,399.40 is: 181,754.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,381.60 : 192,207.90 = 121,399.40 : x
  2. Step 2: Convert to fraction form
    128,381.60/192,207.90 = 121,399.40/x
  3. Step 3: Cross multiply
    128,381.60x = 192,207.90 × 121,399.40
  4. Step 4: Simplify right side
    128,381.60x = 23,333,923,735.26
  5. Step 5: Solve for x
    x = 23,333,923,735.26/128,381.60
  6. Step 6: Final answer
    x = 181,754.42

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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.