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Finding the Fourth Proportional to 620.30, 930.21 and 255.02

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Solution

The fourth proportional to 620.30, 930.21 and 255.02 is: 382.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.30 : 930.21 = 255.02 : x
  2. Step 2: Convert to fraction form
    620.30/930.21 = 255.02/x
  3. Step 3: Cross multiply
    620.30x = 930.21 × 255.02
  4. Step 4: Simplify right side
    620.30x = 237,222.15
  5. Step 5: Solve for x
    x = 237,222.15/620.30
  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.