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Finding the Fourth Proportional to 664.21, 996.31 and 316.49

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Solution

The fourth proportional to 664.21, 996.31 and 316.49 is: 474.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.21 : 996.31 = 316.49 : x
  2. Step 2: Convert to fraction form
    664.21/996.31 = 316.49/x
  3. Step 3: Cross multiply
    664.21x = 996.31 × 316.49
  4. Step 4: Simplify right side
    664.21x = 315,317.57
  5. Step 5: Solve for x
    x = 315,317.57/664.21
  6. Step 6: Final answer
    x = 474.73

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Double scale
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Similar ratio
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1.5x scale

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.