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Finding the Fourth Proportional to 128,989.68, 193,514.52 and 40,238.40

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Solution

The fourth proportional to 128,989.68, 193,514.52 and 40,238.40 is: 60,366.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,989.68 : 193,514.52 = 40,238.40 : x
  2. Step 2: Convert to fraction form
    128,989.68/193,514.52 = 40,238.40/x
  3. Step 3: Cross multiply
    128,989.68x = 193,514.52 × 40,238.40
  4. Step 4: Simplify right side
    128,989.68x = 7,786,714,661.57
  5. Step 5: Solve for x
    x = 7,786,714,661.57/128,989.68
  6. Step 6: Final answer
    x = 60,366.96

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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.