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Finding the Fourth Proportional to 423.08, 633.12 and 408.80

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Solution

The fourth proportional to 423.08, 633.12 and 408.80 is: 611.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.08 : 633.12 = 408.80 : x
  2. Step 2: Convert to fraction form
    423.08/633.12 = 408.80/x
  3. Step 3: Cross multiply
    423.08x = 633.12 × 408.80
  4. Step 4: Simplify right side
    423.08x = 258,819.46
  5. Step 5: Solve for x
    x = 258,819.46/423.08
  6. Step 6: Final answer
    x = 611.75

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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.