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Finding the Fourth Proportional to 406.81, 609.91 and 211.94

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Solution

The fourth proportional to 406.81, 609.91 and 211.94 is: 317.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.81 : 609.91 = 211.94 : x
  2. Step 2: Convert to fraction form
    406.81/609.91 = 211.94/x
  3. Step 3: Cross multiply
    406.81x = 609.91 × 211.94
  4. Step 4: Simplify right side
    406.81x = 129,260.75
  5. Step 5: Solve for x
    x = 129,260.75/406.81
  6. Step 6: Final answer
    x = 317.74

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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.