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Finding the Fourth Proportional to 353.05, 528.75 and 255.31

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Solution

The fourth proportional to 353.05, 528.75 and 255.31 is: 382.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.05 : 528.75 = 255.31 : x
  2. Step 2: Convert to fraction form
    353.05/528.75 = 255.31/x
  3. Step 3: Cross multiply
    353.05x = 528.75 × 255.31
  4. Step 4: Simplify right side
    353.05x = 134,993.84
  5. Step 5: Solve for x
    x = 134,993.84/353.05
  6. Step 6: Final answer
    x = 382.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.