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Finding the Fourth Proportional to 251.44, 375.61 and 212.74

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Solution

The fourth proportional to 251.44, 375.61 and 212.74 is: 317.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.44 : 375.61 = 212.74 : x
  2. Step 2: Convert to fraction form
    251.44/375.61 = 212.74/x
  3. Step 3: Cross multiply
    251.44x = 375.61 × 212.74
  4. Step 4: Simplify right side
    251.44x = 79,907.27
  5. Step 5: Solve for x
    x = 79,907.27/251.44
  6. Step 6: Final answer
    x = 317.80

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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.