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Finding the Fourth Proportional to 682.26, 1,022.31 and 389.22

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Solution

The fourth proportional to 682.26, 1,022.31 and 389.22 is: 583.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.26 : 1,022.31 = 389.22 : x
  2. Step 2: Convert to fraction form
    682.26/1,022.31 = 389.22/x
  3. Step 3: Cross multiply
    682.26x = 1,022.31 × 389.22
  4. Step 4: Simplify right side
    682.26x = 397,903.50
  5. Step 5: Solve for x
    x = 397,903.50/682.26
  6. Step 6: Final answer
    x = 583.21

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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.