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Finding the Fourth Proportional to 287.46, 396.63 and 198.80

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Solution

The fourth proportional to 287.46, 396.63 and 198.80 is: 274.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.46 : 396.63 = 198.80 : x
  2. Step 2: Convert to fraction form
    287.46/396.63 = 198.80/x
  3. Step 3: Cross multiply
    287.46x = 396.63 × 198.80
  4. Step 4: Simplify right side
    287.46x = 78,849.43
  5. Step 5: Solve for x
    x = 78,849.43/287.46
  6. Step 6: Final answer
    x = 274.30

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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.