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Finding the Fourth Proportional to 2,127.78, 3,189.20 and 828.14

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Solution

The fourth proportional to 2,127.78, 3,189.20 and 828.14 is: 1,241.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,127.78 : 3,189.20 = 828.14 : x
  2. Step 2: Convert to fraction form
    2,127.78/3,189.20 = 828.14/x
  3. Step 3: Cross multiply
    2,127.78x = 3,189.20 × 828.14
  4. Step 4: Simplify right side
    2,127.78x = 2,641,104.09
  5. Step 5: Solve for x
    x = 2,641,104.09/2,127.78
  6. Step 6: Final answer
    x = 1,241.25

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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.