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Finding the Fourth Proportional to 825.42, 1,238.31 and 248.25

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Solution

The fourth proportional to 825.42, 1,238.31 and 248.25 is: 372.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.42 : 1,238.31 = 248.25 : x
  2. Step 2: Convert to fraction form
    825.42/1,238.31 = 248.25/x
  3. Step 3: Cross multiply
    825.42x = 1,238.31 × 248.25
  4. Step 4: Simplify right side
    825.42x = 307,410.46
  5. Step 5: Solve for x
    x = 307,410.46/825.42
  6. Step 6: Final answer
    x = 372.43

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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.