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Finding the Fourth Proportional to 408.60, 609.75 and 336.60

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Solution

The fourth proportional to 408.60, 609.75 and 336.60 is: 502.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.60 : 609.75 = 336.60 : x
  2. Step 2: Convert to fraction form
    408.60/609.75 = 336.60/x
  3. Step 3: Cross multiply
    408.60x = 609.75 × 336.60
  4. Step 4: Simplify right side
    408.60x = 205,241.85
  5. Step 5: Solve for x
    x = 205,241.85/408.60
  6. Step 6: Final answer
    x = 502.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.