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Finding the Fourth Proportional to 326.88, 490.32 and 218.75

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Solution

The fourth proportional to 326.88, 490.32 and 218.75 is: 328.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.88 : 490.32 = 218.75 : x
  2. Step 2: Convert to fraction form
    326.88/490.32 = 218.75/x
  3. Step 3: Cross multiply
    326.88x = 490.32 × 218.75
  4. Step 4: Simplify right side
    326.88x = 107,255.05
  5. Step 5: Solve for x
    x = 107,255.05/326.88
  6. Step 6: Final answer
    x = 328.12

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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.