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Finding the Fourth Proportional to 664.24, 996.60 and 339.64

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Solution

The fourth proportional to 664.24, 996.60 and 339.64 is: 509.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.24 : 996.60 = 339.64 : x
  2. Step 2: Convert to fraction form
    664.24/996.60 = 339.64/x
  3. Step 3: Cross multiply
    664.24x = 996.60 × 339.64
  4. Step 4: Simplify right side
    664.24x = 338,485.22
  5. Step 5: Solve for x
    x = 338,485.22/664.24
  6. Step 6: Final answer
    x = 509.58

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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.