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Finding the Fourth Proportional to 613.28, 920.17 and 321

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Solution

The fourth proportional to 613.28, 920.17 and 321 is: 481.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.28 : 920.17 = 321 : x
  2. Step 2: Convert to fraction form
    613.28/920.17 = 321/x
  3. Step 3: Cross multiply
    613.28x = 920.17 × 321
  4. Step 4: Simplify right side
    613.28x = 295,374.57
  5. Step 5: Solve for x
    x = 295,374.57/613.28
  6. Step 6: Final answer
    x = 481.63

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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.