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Finding the Fourth Proportional to 324.36, 447.30 and 289.44

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Solution

The fourth proportional to 324.36, 447.30 and 289.44 is: 399.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.36 : 447.30 = 289.44 : x
  2. Step 2: Convert to fraction form
    324.36/447.30 = 289.44/x
  3. Step 3: Cross multiply
    324.36x = 447.30 × 289.44
  4. Step 4: Simplify right side
    324.36x = 129,466.51
  5. Step 5: Solve for x
    x = 129,466.51/324.36
  6. Step 6: Final answer
    x = 399.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.