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Finding the Fourth Proportional to 843.56, 1,163.40 and 668.60

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Solution

The fourth proportional to 843.56, 1,163.40 and 668.60 is: 922.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.56 : 1,163.40 = 668.60 : x
  2. Step 2: Convert to fraction form
    843.56/1,163.40 = 668.60/x
  3. Step 3: Cross multiply
    843.56x = 1,163.40 × 668.60
  4. Step 4: Simplify right side
    843.56x = 777,849.24
  5. Step 5: Solve for x
    x = 777,849.24/843.56
  6. Step 6: Final answer
    x = 922.10

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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.