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Finding the Fourth Proportional to 328.05, 452.18 and 217.49

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Solution

The fourth proportional to 328.05, 452.18 and 217.49 is: 299.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.05 : 452.18 = 217.49 : x
  2. Step 2: Convert to fraction form
    328.05/452.18 = 217.49/x
  3. Step 3: Cross multiply
    328.05x = 452.18 × 217.49
  4. Step 4: Simplify right side
    328.05x = 98,342.91
  5. Step 5: Solve for x
    x = 98,342.91/328.05
  6. Step 6: Final answer
    x = 299.78

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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.