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Finding the Fourth Proportional to 324.18, 485.79 and 221.12

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Solution

The fourth proportional to 324.18, 485.79 and 221.12 is: 331.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.18 : 485.79 = 221.12 : x
  2. Step 2: Convert to fraction form
    324.18/485.79 = 221.12/x
  3. Step 3: Cross multiply
    324.18x = 485.79 × 221.12
  4. Step 4: Simplify right side
    324.18x = 107,415.46
  5. Step 5: Solve for x
    x = 107,415.46/324.18
  6. Step 6: Final answer
    x = 331.35

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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.