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Finding the Fourth Proportional to 139,578.14, 192,556.05 and 85,831.40

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Solution

The fourth proportional to 139,578.14, 192,556.05 and 85,831.40 is: 118,409.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,578.14 : 192,556.05 = 85,831.40 : x
  2. Step 2: Convert to fraction form
    139,578.14/192,556.05 = 85,831.40/x
  3. Step 3: Cross multiply
    139,578.14x = 192,556.05 × 85,831.40
  4. Step 4: Simplify right side
    139,578.14x = 16,527,354,387.19
  5. Step 5: Solve for x
    x = 16,527,354,387.19/139,578.14
  6. Step 6: Final answer
    x = 118,409.34

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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.