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Finding the Fourth Proportional to 139,040.57, 191,885.82 and 78,611.80

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Solution

The fourth proportional to 139,040.57, 191,885.82 and 78,611.80 is: 108,489.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,040.57 : 191,885.82 = 78,611.80 : x
  2. Step 2: Convert to fraction form
    139,040.57/191,885.82 = 78,611.80/x
  3. Step 3: Cross multiply
    139,040.57x = 191,885.82 × 78,611.80
  4. Step 4: Simplify right side
    139,040.57x = 15,084,489,704.68
  5. Step 5: Solve for x
    x = 15,084,489,704.68/139,040.57
  6. Step 6: Final answer
    x = 108,489.84

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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.