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Finding the Fourth Proportional to 386.82, 533.57 and 281.78

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Solution

The fourth proportional to 386.82, 533.57 and 281.78 is: 388.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.82 : 533.57 = 281.78 : x
  2. Step 2: Convert to fraction form
    386.82/533.57 = 281.78/x
  3. Step 3: Cross multiply
    386.82x = 533.57 × 281.78
  4. Step 4: Simplify right side
    386.82x = 150,349.35
  5. Step 5: Solve for x
    x = 150,349.35/386.82
  6. Step 6: Final answer
    x = 388.68

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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.