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Finding the Fourth Proportional to 414.33, 621.31 and 209

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Solution

The fourth proportional to 414.33, 621.31 and 209 is: 313.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.33 : 621.31 = 209 : x
  2. Step 2: Convert to fraction form
    414.33/621.31 = 209/x
  3. Step 3: Cross multiply
    414.33x = 621.31 × 209
  4. Step 4: Simplify right side
    414.33x = 129,853.79
  5. Step 5: Solve for x
    x = 129,853.79/414.33
  6. Step 6: Final answer
    x = 313.41

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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.