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Finding the Fourth Proportional to 238.38, 356.76 and 209.58

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Solution

The fourth proportional to 238.38, 356.76 and 209.58 is: 313.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.38 : 356.76 = 209.58 : x
  2. Step 2: Convert to fraction form
    238.38/356.76 = 209.58/x
  3. Step 3: Cross multiply
    238.38x = 356.76 × 209.58
  4. Step 4: Simplify right side
    238.38x = 74,769.76
  5. Step 5: Solve for x
    x = 74,769.76/238.38
  6. Step 6: Final answer
    x = 313.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.