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Finding the Fourth Proportional to 326.28, 450.78 and 216.12

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Solution

The fourth proportional to 326.28, 450.78 and 216.12 is: 298.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.28 : 450.78 = 216.12 : x
  2. Step 2: Convert to fraction form
    326.28/450.78 = 216.12/x
  3. Step 3: Cross multiply
    326.28x = 450.78 × 216.12
  4. Step 4: Simplify right side
    326.28x = 97,422.57
  5. Step 5: Solve for x
    x = 97,422.57/326.28
  6. Step 6: Final answer
    x = 298.59

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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.