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Finding the Fourth Proportional to 208.28, 287.21 and 178.88

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Solution

The fourth proportional to 208.28, 287.21 and 178.88 is: 246.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.28 : 287.21 = 178.88 : x
  2. Step 2: Convert to fraction form
    208.28/287.21 = 178.88/x
  3. Step 3: Cross multiply
    208.28x = 287.21 × 178.88
  4. Step 4: Simplify right side
    208.28x = 51,375.14
  5. Step 5: Solve for x
    x = 51,375.14/208.28
  6. Step 6: Final answer
    x = 246.66

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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.