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Finding the Fourth Proportional to 312,659.05, 431,303.09 and 190,188.87

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Solution

The fourth proportional to 312,659.05, 431,303.09 and 190,188.87 is: 262,359.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,659.05 : 431,303.09 = 190,188.87 : x
  2. Step 2: Convert to fraction form
    312,659.05/431,303.09 = 190,188.87/x
  3. Step 3: Cross multiply
    312,659.05x = 431,303.09 × 190,188.87
  4. Step 4: Simplify right side
    312,659.05x = 82,029,047,076.87
  5. Step 5: Solve for x
    x = 82,029,047,076.87/312,659.05
  6. Step 6: Final answer
    x = 262,359.42

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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.