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Finding the Fourth Proportional to 406.49, 609.85 and 221.36

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Solution

The fourth proportional to 406.49, 609.85 and 221.36 is: 332.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.49 : 609.85 = 221.36 : x
  2. Step 2: Convert to fraction form
    406.49/609.85 = 221.36/x
  3. Step 3: Cross multiply
    406.49x = 609.85 × 221.36
  4. Step 4: Simplify right side
    406.49x = 134,993.35
  5. Step 5: Solve for x
    x = 134,993.35/406.49
  6. Step 6: Final answer
    x = 332.10

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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.