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Finding the Fourth Proportional to 2,161.09, 3,242.21 and 774.55

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Solution

The fourth proportional to 2,161.09, 3,242.21 and 774.55 is: 1,162.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,161.09 : 3,242.21 = 774.55 : x
  2. Step 2: Convert to fraction form
    2,161.09/3,242.21 = 774.55/x
  3. Step 3: Cross multiply
    2,161.09x = 3,242.21 × 774.55
  4. Step 4: Simplify right side
    2,161.09x = 2,511,253.76
  5. Step 5: Solve for x
    x = 2,511,253.76/2,161.09
  6. Step 6: Final answer
    x = 1,162.03

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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.