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Finding the Fourth Proportional to 829.39, 1,243.80 and 281.44

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Solution

The fourth proportional to 829.39, 1,243.80 and 281.44 is: 422.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.39 : 1,243.80 = 281.44 : x
  2. Step 2: Convert to fraction form
    829.39/1,243.80 = 281.44/x
  3. Step 3: Cross multiply
    829.39x = 1,243.80 × 281.44
  4. Step 4: Simplify right side
    829.39x = 350,059.05
  5. Step 5: Solve for x
    x = 350,059.05/829.39
  6. Step 6: Final answer
    x = 422.07

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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.