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Finding the Fourth Proportional to 433.62, 649.99 and 213.76

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Solution

The fourth proportional to 433.62, 649.99 and 213.76 is: 320.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    433.62 : 649.99 = 213.76 : x
  2. Step 2: Convert to fraction form
    433.62/649.99 = 213.76/x
  3. Step 3: Cross multiply
    433.62x = 649.99 × 213.76
  4. Step 4: Simplify right side
    433.62x = 138,939.29
  5. Step 5: Solve for x
    x = 138,939.29/433.62
  6. Step 6: Final answer
    x = 320.42

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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.