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Finding the Fourth Proportional to 274.06, 378.30 and 208.45

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Solution

The fourth proportional to 274.06, 378.30 and 208.45 is: 287.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.06 : 378.30 = 208.45 : x
  2. Step 2: Convert to fraction form
    274.06/378.30 = 208.45/x
  3. Step 3: Cross multiply
    274.06x = 378.30 × 208.45
  4. Step 4: Simplify right side
    274.06x = 78,856.64
  5. Step 5: Solve for x
    x = 78,856.64/274.06
  6. Step 6: Final answer
    x = 287.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.