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Finding the Fourth Proportional to 664.26, 996.78 and 613.53

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Solution

The fourth proportional to 664.26, 996.78 and 613.53 is: 920.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.26 : 996.78 = 613.53 : x
  2. Step 2: Convert to fraction form
    664.26/996.78 = 613.53/x
  3. Step 3: Cross multiply
    664.26x = 996.78 × 613.53
  4. Step 4: Simplify right side
    664.26x = 611,554.43
  5. Step 5: Solve for x
    x = 611,554.43/664.26
  6. Step 6: Final answer
    x = 920.66

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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.