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Finding the Fourth Proportional to 111,912.15, 154,438.34 and 61,611.15

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Solution

The fourth proportional to 111,912.15, 154,438.34 and 61,611.15 is: 85,023.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,912.15 : 154,438.34 = 61,611.15 : x
  2. Step 2: Convert to fraction form
    111,912.15/154,438.34 = 61,611.15/x
  3. Step 3: Cross multiply
    111,912.15x = 154,438.34 × 61,611.15
  4. Step 4: Simplify right side
    111,912.15x = 9,515,123,423.44
  5. Step 5: Solve for x
    x = 9,515,123,423.44/111,912.15
  6. Step 6: Final answer
    x = 85,023.15

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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.