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Finding the Fourth Proportional to 613.96, 920.78 and 223.88

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Solution

The fourth proportional to 613.96, 920.78 and 223.88 is: 335.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.96 : 920.78 = 223.88 : x
  2. Step 2: Convert to fraction form
    613.96/920.78 = 223.88/x
  3. Step 3: Cross multiply
    613.96x = 920.78 × 223.88
  4. Step 4: Simplify right side
    613.96x = 206,146.53
  5. Step 5: Solve for x
    x = 206,146.53/613.96
  6. Step 6: Final answer
    x = 335.77

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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.