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Finding the Fourth Proportional to 620.31, 930.39 and 255.05

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Solution

The fourth proportional to 620.31, 930.39 and 255.05 is: 382.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.31 : 930.39 = 255.05 : x
  2. Step 2: Convert to fraction form
    620.31/930.39 = 255.05/x
  3. Step 3: Cross multiply
    620.31x = 930.39 × 255.05
  4. Step 4: Simplify right side
    620.31x = 237,293.85
  5. Step 5: Solve for x
    x = 237,293.85/620.31
  6. Step 6: Final answer
    x = 382.54

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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.