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Finding the Fourth Proportional to 289.90, 434.37 and 212.89

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Solution

The fourth proportional to 289.90, 434.37 and 212.89 is: 318.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.90 : 434.37 = 212.89 : x
  2. Step 2: Convert to fraction form
    289.90/434.37 = 212.89/x
  3. Step 3: Cross multiply
    289.90x = 434.37 × 212.89
  4. Step 4: Simplify right side
    289.90x = 92,471.76
  5. Step 5: Solve for x
    x = 92,471.76/289.90
  6. Step 6: Final answer
    x = 318.98

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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.