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Finding the Fourth Proportional to 620.61, 930.09 and 255.18

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Solution

The fourth proportional to 620.61, 930.09 and 255.18 is: 382.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.61 : 930.09 = 255.18 : x
  2. Step 2: Convert to fraction form
    620.61/930.09 = 255.18/x
  3. Step 3: Cross multiply
    620.61x = 930.09 × 255.18
  4. Step 4: Simplify right side
    620.61x = 237,340.37
  5. Step 5: Solve for x
    x = 237,340.37/620.61
  6. Step 6: Final answer
    x = 382.43

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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.