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Finding the Fourth Proportional to 620.14, 930.60 and 331.78

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Solution

The fourth proportional to 620.14, 930.60 and 331.78 is: 497.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.14 : 930.60 = 331.78 : x
  2. Step 2: Convert to fraction form
    620.14/930.60 = 331.78/x
  3. Step 3: Cross multiply
    620.14x = 930.60 × 331.78
  4. Step 4: Simplify right side
    620.14x = 308,754.47
  5. Step 5: Solve for x
    x = 308,754.47/620.14
  6. Step 6: Final answer
    x = 497.88

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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.