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Finding the Fourth Proportional to 238.38, 330.65 and 228.30

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Solution

The fourth proportional to 238.38, 330.65 and 228.30 is: 316.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.38 : 330.65 = 228.30 : x
  2. Step 2: Convert to fraction form
    238.38/330.65 = 228.30/x
  3. Step 3: Cross multiply
    238.38x = 330.65 × 228.30
  4. Step 4: Simplify right side
    238.38x = 75,486.25
  5. Step 5: Solve for x
    x = 75,486.25/238.38
  6. Step 6: Final answer
    x = 316.66

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.