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Finding the Fourth Proportional to 139,078.89, 191,928.69 and 75,416.58

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Solution

The fourth proportional to 139,078.89, 191,928.69 and 75,416.58 is: 104,074.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,078.89 : 191,928.69 = 75,416.58 : x
  2. Step 2: Convert to fraction form
    139,078.89/191,928.69 = 75,416.58/x
  3. Step 3: Cross multiply
    139,078.89x = 191,928.69 × 75,416.58
  4. Step 4: Simplify right side
    139,078.89x = 14,474,605,403.68
  5. Step 5: Solve for x
    x = 14,474,605,403.68/139,078.89
  6. Step 6: Final answer
    x = 104,074.78

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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.