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Finding the Fourth Proportional to 405.94, 609.18 and 220.85

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Solution

The fourth proportional to 405.94, 609.18 and 220.85 is: 331.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.94 : 609.18 = 220.85 : x
  2. Step 2: Convert to fraction form
    405.94/609.18 = 220.85/x
  3. Step 3: Cross multiply
    405.94x = 609.18 × 220.85
  4. Step 4: Simplify right side
    405.94x = 134,537.40
  5. Step 5: Solve for x
    x = 134,537.40/405.94
  6. Step 6: Final answer
    x = 331.42

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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.