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Finding the Fourth Proportional to 324.09, 447.30 and 309.51

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Solution

The fourth proportional to 324.09, 447.30 and 309.51 is: 427.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.09 : 447.30 = 309.51 : x
  2. Step 2: Convert to fraction form
    324.09/447.30 = 309.51/x
  3. Step 3: Cross multiply
    324.09x = 447.30 × 309.51
  4. Step 4: Simplify right side
    324.09x = 138,443.82
  5. Step 5: Solve for x
    x = 138,443.82/324.09
  6. Step 6: Final answer
    x = 427.18

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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.