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Finding the Fourth Proportional to 238.88, 356.23 and 212.66

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Solution

The fourth proportional to 238.88, 356.23 and 212.66 is: 317.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.88 : 356.23 = 212.66 : x
  2. Step 2: Convert to fraction form
    238.88/356.23 = 212.66/x
  3. Step 3: Cross multiply
    238.88x = 356.23 × 212.66
  4. Step 4: Simplify right side
    238.88x = 75,755.87
  5. Step 5: Solve for x
    x = 75,755.87/238.88
  6. Step 6: Final answer
    x = 317.13

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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.