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Finding the Fourth Proportional to 289.49, 433.45 and 220.68

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Solution

The fourth proportional to 289.49, 433.45 and 220.68 is: 330.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.49 : 433.45 = 220.68 : x
  2. Step 2: Convert to fraction form
    289.49/433.45 = 220.68/x
  3. Step 3: Cross multiply
    289.49x = 433.45 × 220.68
  4. Step 4: Simplify right side
    289.49x = 95,654.02
  5. Step 5: Solve for x
    x = 95,654.02/289.49
  6. Step 6: Final answer
    x = 330.43

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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.