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Finding the Fourth Proportional to 289.75, 434.36 and 212.60

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Solution

The fourth proportional to 289.75, 434.36 and 212.60 is: 318.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.75 : 434.36 = 212.60 : x
  2. Step 2: Convert to fraction form
    289.75/434.36 = 212.60/x
  3. Step 3: Cross multiply
    289.75x = 434.36 × 212.60
  4. Step 4: Simplify right side
    289.75x = 92,344.94
  5. Step 5: Solve for x
    x = 92,344.94/289.75
  6. Step 6: Final answer
    x = 318.71

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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.