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Finding the Fourth Proportional to 251.43, 376.43 and 212.91

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Solution

The fourth proportional to 251.43, 376.43 and 212.91 is: 318.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.43 : 376.43 = 212.91 : x
  2. Step 2: Convert to fraction form
    251.43/376.43 = 212.91/x
  3. Step 3: Cross multiply
    251.43x = 376.43 × 212.91
  4. Step 4: Simplify right side
    251.43x = 80,144.65
  5. Step 5: Solve for x
    x = 80,144.65/251.43
  6. Step 6: Final answer
    x = 318.76

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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.