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Finding the Fourth Proportional to 408.28, 612.09 and 188.92

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Solution

The fourth proportional to 408.28, 612.09 and 188.92 is: 283.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.28 : 612.09 = 188.92 : x
  2. Step 2: Convert to fraction form
    408.28/612.09 = 188.92/x
  3. Step 3: Cross multiply
    408.28x = 612.09 × 188.92
  4. Step 4: Simplify right side
    408.28x = 115,636.04
  5. Step 5: Solve for x
    x = 115,636.04/408.28
  6. Step 6: Final answer
    x = 283.23

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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.