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Finding the Fourth Proportional to 863.21, 1,295.43 and 668.66

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Solution

The fourth proportional to 863.21, 1,295.43 and 668.66 is: 1,003.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.21 : 1,295.43 = 668.66 : x
  2. Step 2: Convert to fraction form
    863.21/1,295.43 = 668.66/x
  3. Step 3: Cross multiply
    863.21x = 1,295.43 × 668.66
  4. Step 4: Simplify right side
    863.21x = 866,202.22
  5. Step 5: Solve for x
    x = 866,202.22/863.21
  6. Step 6: Final answer
    x = 1,003.47

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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.