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Finding the Fourth Proportional to 613.91, 920.57 and 223.90

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Solution

The fourth proportional to 613.91, 920.57 and 223.90 is: 335.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.91 : 920.57 = 223.90 : x
  2. Step 2: Convert to fraction form
    613.91/920.57 = 223.90/x
  3. Step 3: Cross multiply
    613.91x = 920.57 × 223.90
  4. Step 4: Simplify right side
    613.91x = 206,112.20
  5. Step 5: Solve for x
    x = 206,112.20/613.91
  6. Step 6: Final answer
    x = 335.74

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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.