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Finding the Fourth Proportional to 154,172.62, 212,768.09 and 86,189.86

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Solution

The fourth proportional to 154,172.62, 212,768.09 and 86,189.86 is: 118,947.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,172.62 : 212,768.09 = 86,189.86 : x
  2. Step 2: Convert to fraction form
    154,172.62/212,768.09 = 86,189.86/x
  3. Step 3: Cross multiply
    154,172.62x = 212,768.09 × 86,189.86
  4. Step 4: Simplify right side
    154,172.62x = 18,338,451,889.57
  5. Step 5: Solve for x
    x = 18,338,451,889.57/154,172.62
  6. Step 6: Final answer
    x = 118,947.53

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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.