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Finding the Fourth Proportional to 843.70, 1,163.42 and 666.36

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Solution

The fourth proportional to 843.70, 1,163.42 and 666.36 is: 918.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.70 : 1,163.42 = 666.36 : x
  2. Step 2: Convert to fraction form
    843.70/1,163.42 = 666.36/x
  3. Step 3: Cross multiply
    843.70x = 1,163.42 × 666.36
  4. Step 4: Simplify right side
    843.70x = 775,256.55
  5. Step 5: Solve for x
    x = 775,256.55/843.70
  6. Step 6: Final answer
    x = 918.88

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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.