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Finding the Fourth Proportional to 408.34, 611.45 and 320.91

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Solution

The fourth proportional to 408.34, 611.45 and 320.91 is: 480.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.34 : 611.45 = 320.91 : x
  2. Step 2: Convert to fraction form
    408.34/611.45 = 320.91/x
  3. Step 3: Cross multiply
    408.34x = 611.45 × 320.91
  4. Step 4: Simplify right side
    408.34x = 196,221.16
  5. Step 5: Solve for x
    x = 196,221.16/408.34
  6. Step 6: Final answer
    x = 480.53

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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.