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Finding the Fourth Proportional to 289.13, 433.85 and 221.09

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Solution

The fourth proportional to 289.13, 433.85 and 221.09 is: 331.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.13 : 433.85 = 221.09 : x
  2. Step 2: Convert to fraction form
    289.13/433.85 = 221.09/x
  3. Step 3: Cross multiply
    289.13x = 433.85 × 221.09
  4. Step 4: Simplify right side
    289.13x = 95,918.25
  5. Step 5: Solve for x
    x = 95,918.25/289.13
  6. Step 6: Final answer
    x = 331.75

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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.