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Finding the Fourth Proportional to 825.90, 1,238.81 and 338.95

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Solution

The fourth proportional to 825.90, 1,238.81 and 338.95 is: 508.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.90 : 1,238.81 = 338.95 : x
  2. Step 2: Convert to fraction form
    825.90/1,238.81 = 338.95/x
  3. Step 3: Cross multiply
    825.90x = 1,238.81 × 338.95
  4. Step 4: Simplify right side
    825.90x = 419,896.41
  5. Step 5: Solve for x
    x = 419,896.41/825.90
  6. Step 6: Final answer
    x = 508.41

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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.