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Finding the Fourth Proportional to 139,115.37, 191,983.56 and 78,684.84

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Solution

The fourth proportional to 139,115.37, 191,983.56 and 78,684.84 is: 108,587.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,115.37 : 191,983.56 = 78,684.84 : x
  2. Step 2: Convert to fraction form
    139,115.37/191,983.56 = 78,684.84/x
  3. Step 3: Cross multiply
    139,115.37x = 191,983.56 × 78,684.84
  4. Step 4: Simplify right side
    139,115.37x = 15,106,195,701.23
  5. Step 5: Solve for x
    x = 15,106,195,701.23/139,115.37
  6. Step 6: Final answer
    x = 108,587.54

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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.