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Finding the Fourth Proportional to 329.81, 494.64 and 208.31

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Solution

The fourth proportional to 329.81, 494.64 and 208.31 is: 312.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.81 : 494.64 = 208.31 : x
  2. Step 2: Convert to fraction form
    329.81/494.64 = 208.31/x
  3. Step 3: Cross multiply
    329.81x = 494.64 × 208.31
  4. Step 4: Simplify right side
    329.81x = 103,035.99
  5. Step 5: Solve for x
    x = 103,035.99/329.81
  6. Step 6: Final answer
    x = 312.41

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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.