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Finding the Fourth Proportional to 238.08, 328 and 217.12

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Solution

The fourth proportional to 238.08, 328 and 217.12 is: 299.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.08 : 328 = 217.12 : x
  2. Step 2: Convert to fraction form
    238.08/328 = 217.12/x
  3. Step 3: Cross multiply
    238.08x = 328 × 217.12
  4. Step 4: Simplify right side
    238.08x = 71,215.36
  5. Step 5: Solve for x
    x = 71,215.36/238.08
  6. Step 6: Final answer
    x = 299.12

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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.