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Finding the Fourth Proportional to 620.82, 930.62 and 255.70

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Solution

The fourth proportional to 620.82, 930.62 and 255.70 is: 383.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.82 : 930.62 = 255.70 : x
  2. Step 2: Convert to fraction form
    620.82/930.62 = 255.70/x
  3. Step 3: Cross multiply
    620.82x = 930.62 × 255.70
  4. Step 4: Simplify right side
    620.82x = 237,959.53
  5. Step 5: Solve for x
    x = 237,959.53/620.82
  6. Step 6: Final answer
    x = 383.30

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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.