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Finding the Fourth Proportional to 406.49, 609.44 and 211.41

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Solution

The fourth proportional to 406.49, 609.44 and 211.41 is: 316.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.49 : 609.44 = 211.41 : x
  2. Step 2: Convert to fraction form
    406.49/609.44 = 211.41/x
  3. Step 3: Cross multiply
    406.49x = 609.44 × 211.41
  4. Step 4: Simplify right side
    406.49x = 128,840.65
  5. Step 5: Solve for x
    x = 128,840.65/406.49
  6. Step 6: Final answer
    x = 316.96

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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.