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Finding the Fourth Proportional to 211.07, 315.79 and 142.27

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Solution

The fourth proportional to 211.07, 315.79 and 142.27 is: 212.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.07 : 315.79 = 142.27 : x
  2. Step 2: Convert to fraction form
    211.07/315.79 = 142.27/x
  3. Step 3: Cross multiply
    211.07x = 315.79 × 142.27
  4. Step 4: Simplify right side
    211.07x = 44,927.44
  5. Step 5: Solve for x
    x = 44,927.44/211.07
  6. Step 6: Final answer
    x = 212.86

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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.