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Finding the Fourth Proportional to 286.80, 396 and 199.56

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Solution

The fourth proportional to 286.80, 396 and 199.56 is: 275.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.80 : 396 = 199.56 : x
  2. Step 2: Convert to fraction form
    286.80/396 = 199.56/x
  3. Step 3: Cross multiply
    286.80x = 396 × 199.56
  4. Step 4: Simplify right side
    286.80x = 79,025.76
  5. Step 5: Solve for x
    x = 79,025.76/286.80
  6. Step 6: Final answer
    x = 275.54

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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.