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Finding the Fourth Proportional to 664.48, 996.16 and 279.68

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Solution

The fourth proportional to 664.48, 996.16 and 279.68 is: 419.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.48 : 996.16 = 279.68 : x
  2. Step 2: Convert to fraction form
    664.48/996.16 = 279.68/x
  3. Step 3: Cross multiply
    664.48x = 996.16 × 279.68
  4. Step 4: Simplify right side
    664.48x = 278,606.03
  5. Step 5: Solve for x
    x = 278,606.03/664.48
  6. Step 6: Final answer
    x = 419.28

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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.