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Finding the Fourth Proportional to 326.12, 449.91 and 209.75

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Solution

The fourth proportional to 326.12, 449.91 and 209.75 is: 289.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.12 : 449.91 = 209.75 : x
  2. Step 2: Convert to fraction form
    326.12/449.91 = 209.75/x
  3. Step 3: Cross multiply
    326.12x = 449.91 × 209.75
  4. Step 4: Simplify right side
    326.12x = 94,366.37
  5. Step 5: Solve for x
    x = 94,366.37/326.12
  6. Step 6: Final answer
    x = 289.37

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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.