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Finding the Fourth Proportional to 664.56, 996.89 and 318.08

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Solution

The fourth proportional to 664.56, 996.89 and 318.08 is: 477.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.56 : 996.89 = 318.08 : x
  2. Step 2: Convert to fraction form
    664.56/996.89 = 318.08/x
  3. Step 3: Cross multiply
    664.56x = 996.89 × 318.08
  4. Step 4: Simplify right side
    664.56x = 317,090.77
  5. Step 5: Solve for x
    x = 317,090.77/664.56
  6. Step 6: Final answer
    x = 477.14

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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.