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Finding the Fourth Proportional to 406.63, 609.67 and 221.55

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Solution

The fourth proportional to 406.63, 609.67 and 221.55 is: 332.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.63 : 609.67 = 221.55 : x
  2. Step 2: Convert to fraction form
    406.63/609.67 = 221.55/x
  3. Step 3: Cross multiply
    406.63x = 609.67 × 221.55
  4. Step 4: Simplify right side
    406.63x = 135,072.39
  5. Step 5: Solve for x
    x = 135,072.39/406.63
  6. Step 6: Final answer
    x = 332.18

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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.