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Finding the Fourth Proportional to 251.99, 378.05 and 208.45

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Solution

The fourth proportional to 251.99, 378.05 and 208.45 is: 312.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.99 : 378.05 = 208.45 : x
  2. Step 2: Convert to fraction form
    251.99/378.05 = 208.45/x
  3. Step 3: Cross multiply
    251.99x = 378.05 × 208.45
  4. Step 4: Simplify right side
    251.99x = 78,804.52
  5. Step 5: Solve for x
    x = 78,804.52/251.99
  6. Step 6: Final answer
    x = 312.73

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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.