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Finding the Fourth Proportional to 328.11, 452.31 and 217.40

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Solution

The fourth proportional to 328.11, 452.31 and 217.40 is: 299.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.11 : 452.31 = 217.40 : x
  2. Step 2: Convert to fraction form
    328.11/452.31 = 217.40/x
  3. Step 3: Cross multiply
    328.11x = 452.31 × 217.40
  4. Step 4: Simplify right side
    328.11x = 98,328.85
  5. Step 5: Solve for x
    x = 98,328.85/328.11
  6. Step 6: Final answer
    x = 299.68

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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.