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Finding the Fourth Proportional to 664.95, 996.81 and 339.60

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Solution

The fourth proportional to 664.95, 996.81 and 339.60 is: 509.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.95 : 996.81 = 339.60 : x
  2. Step 2: Convert to fraction form
    664.95/996.81 = 339.60/x
  3. Step 3: Cross multiply
    664.95x = 996.81 × 339.60
  4. Step 4: Simplify right side
    664.95x = 338,516.68
  5. Step 5: Solve for x
    x = 338,516.68/664.95
  6. Step 6: Final answer
    x = 509.09

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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.