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Finding the Fourth Proportional to 3,190.80, 4,786.20 and 1,891.60

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Solution

The fourth proportional to 3,190.80, 4,786.20 and 1,891.60 is: 2,837.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,190.80 : 4,786.20 = 1,891.60 : x
  2. Step 2: Convert to fraction form
    3,190.80/4,786.20 = 1,891.60/x
  3. Step 3: Cross multiply
    3,190.80x = 4,786.20 × 1,891.60
  4. Step 4: Simplify right side
    3,190.80x = 9,053,575.92
  5. Step 5: Solve for x
    x = 9,053,575.92/3,190.80
  6. Step 6: Final answer
    x = 2,837.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.