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Finding the Fourth Proportional to 386.08, 533.26 and 281.50

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Solution

The fourth proportional to 386.08, 533.26 and 281.50 is: 388.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.08 : 533.26 = 281.50 : x
  2. Step 2: Convert to fraction form
    386.08/533.26 = 281.50/x
  3. Step 3: Cross multiply
    386.08x = 533.26 × 281.50
  4. Step 4: Simplify right side
    386.08x = 150,112.69
  5. Step 5: Solve for x
    x = 150,112.69/386.08
  6. Step 6: Final answer
    x = 388.81

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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.