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Finding the Fourth Proportional to 825.33, 1,238.31 and 386.82

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Solution

The fourth proportional to 825.33, 1,238.31 and 386.82 is: 580.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.33 : 1,238.31 = 386.82 : x
  2. Step 2: Convert to fraction form
    825.33/1,238.31 = 386.82/x
  3. Step 3: Cross multiply
    825.33x = 1,238.31 × 386.82
  4. Step 4: Simplify right side
    825.33x = 479,003.07
  5. Step 5: Solve for x
    x = 479,003.07/825.33
  6. Step 6: Final answer
    x = 580.38

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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.