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Finding the Fourth Proportional to 328.56, 453.80 and 217.85

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Solution

The fourth proportional to 328.56, 453.80 and 217.85 is: 300.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.56 : 453.80 = 217.85 : x
  2. Step 2: Convert to fraction form
    328.56/453.80 = 217.85/x
  3. Step 3: Cross multiply
    328.56x = 453.80 × 217.85
  4. Step 4: Simplify right side
    328.56x = 98,859.88
  5. Step 5: Solve for x
    x = 98,859.88/328.56
  6. Step 6: Final answer
    x = 300.88

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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.