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Finding the Fourth Proportional to 664.94, 996.80 and 318.06

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Solution

The fourth proportional to 664.94, 996.80 and 318.06 is: 476.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.94 : 996.80 = 318.06 : x
  2. Step 2: Convert to fraction form
    664.94/996.80 = 318.06/x
  3. Step 3: Cross multiply
    664.94x = 996.80 × 318.06
  4. Step 4: Simplify right side
    664.94x = 317,040.62
  5. Step 5: Solve for x
    x = 317,040.62/664.94
  6. Step 6: Final answer
    x = 476.80

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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.