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Finding the Fourth Proportional to 665.21, 996.30 and 318.79

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Solution

The fourth proportional to 665.21, 996.30 and 318.79 is: 477.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.21 : 996.30 = 318.79 : x
  2. Step 2: Convert to fraction form
    665.21/996.30 = 318.79/x
  3. Step 3: Cross multiply
    665.21x = 996.30 × 318.79
  4. Step 4: Simplify right side
    665.21x = 317,609.68
  5. Step 5: Solve for x
    x = 317,609.68/665.21
  6. Step 6: Final answer
    x = 477.46

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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.