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Finding the Fourth Proportional to 408.11, 611.63 and 188.70

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Solution

The fourth proportional to 408.11, 611.63 and 188.70 is: 282.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.11 : 611.63 = 188.70 : x
  2. Step 2: Convert to fraction form
    408.11/611.63 = 188.70/x
  3. Step 3: Cross multiply
    408.11x = 611.63 × 188.70
  4. Step 4: Simplify right side
    408.11x = 115,416.68
  5. Step 5: Solve for x
    x = 115,416.68/408.11
  6. Step 6: Final answer
    x = 282.81

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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.