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Finding the Fourth Proportional to 664, 996 and 279.28

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Solution

The fourth proportional to 664, 996 and 279.28 is: 418.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    664 : 996 = 279.28 : x
  2. Step 2: Convert to fraction form
    664/996 = 279.28/x
  3. Step 3: Cross multiply
    664x = 996 × 279.28
  4. Step 4: Simplify right side
    664x = 278,162.88
  5. Step 5: Solve for x
    x = 278,162.88/664
  6. Step 6: Final answer
    x = 418.92

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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.