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Finding the Fourth Proportional to 238.30, 328.64 and 213.70

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Solution

The fourth proportional to 238.30, 328.64 and 213.70 is: 294.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.30 : 328.64 = 213.70 : x
  2. Step 2: Convert to fraction form
    238.30/328.64 = 213.70/x
  3. Step 3: Cross multiply
    238.30x = 328.64 × 213.70
  4. Step 4: Simplify right side
    238.30x = 70,230.37
  5. Step 5: Solve for x
    x = 70,230.37/238.30
  6. Step 6: Final answer
    x = 294.71

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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.