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Finding the Fourth Proportional to 289.10, 433.17 and 212.09

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Solution

The fourth proportional to 289.10, 433.17 and 212.09 is: 317.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.10 : 433.17 = 212.09 : x
  2. Step 2: Convert to fraction form
    289.10/433.17 = 212.09/x
  3. Step 3: Cross multiply
    289.10x = 433.17 × 212.09
  4. Step 4: Simplify right side
    289.10x = 91,872.11
  5. Step 5: Solve for x
    x = 91,872.11/289.10
  6. Step 6: Final answer
    x = 317.78

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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.