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Finding the Fourth Proportional to 2,775.80, 4,163.74 and 828.09

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Solution

The fourth proportional to 2,775.80, 4,163.74 and 828.09 is: 1,242.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,775.80 : 4,163.74 = 828.09 : x
  2. Step 2: Convert to fraction form
    2,775.80/4,163.74 = 828.09/x
  3. Step 3: Cross multiply
    2,775.80x = 4,163.74 × 828.09
  4. Step 4: Simplify right side
    2,775.80x = 3,447,949.39
  5. Step 5: Solve for x
    x = 3,447,949.39/2,775.80
  6. Step 6: Final answer
    x = 1,242.15

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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.