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Finding the Fourth Proportional to 324.12, 485.94 and 279

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Solution

The fourth proportional to 324.12, 485.94 and 279 is: 418.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.12 : 485.94 = 279 : x
  2. Step 2: Convert to fraction form
    324.12/485.94 = 279/x
  3. Step 3: Cross multiply
    324.12x = 485.94 × 279
  4. Step 4: Simplify right side
    324.12x = 135,577.26
  5. Step 5: Solve for x
    x = 135,577.26/324.12
  6. Step 6: Final answer
    x = 418.29

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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.