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Finding the Fourth Proportional to 238.85, 356.50 and 211.51

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Solution

The fourth proportional to 238.85, 356.50 and 211.51 is: 315.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.85 : 356.50 = 211.51 : x
  2. Step 2: Convert to fraction form
    238.85/356.50 = 211.51/x
  3. Step 3: Cross multiply
    238.85x = 356.50 × 211.51
  4. Step 4: Simplify right side
    238.85x = 75,404.03
  5. Step 5: Solve for x
    x = 75,404.03/238.85
  6. Step 6: Final answer
    x = 315.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.