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Finding the Fourth Proportional to 324.29, 447.91 and 319.43

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Solution

The fourth proportional to 324.29, 447.91 and 319.43 is: 441.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.29 : 447.91 = 319.43 : x
  2. Step 2: Convert to fraction form
    324.29/447.91 = 319.43/x
  3. Step 3: Cross multiply
    324.29x = 447.91 × 319.43
  4. Step 4: Simplify right side
    324.29x = 143,075.49
  5. Step 5: Solve for x
    x = 143,075.49/324.29
  6. Step 6: Final answer
    x = 441.20

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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.