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Finding the Fourth Proportional to 620.37, 930.78 and 255.20

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Solution

The fourth proportional to 620.37, 930.78 and 255.20 is: 382.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.37 : 930.78 = 255.20 : x
  2. Step 2: Convert to fraction form
    620.37/930.78 = 255.20/x
  3. Step 3: Cross multiply
    620.37x = 930.78 × 255.20
  4. Step 4: Simplify right side
    620.37x = 237,530.40
  5. Step 5: Solve for x
    x = 237,530.40/620.37
  6. Step 6: Final answer
    x = 382.89

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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.