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Finding the Fourth Proportional to 408, 611.60 and 191.19

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Solution

The fourth proportional to 408, 611.60 and 191.19 is: 286.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    408 : 611.60 = 191.19 : x
  2. Step 2: Convert to fraction form
    408/611.60 = 191.19/x
  3. Step 3: Cross multiply
    408x = 611.60 × 191.19
  4. Step 4: Simplify right side
    408x = 116,930.85
  5. Step 5: Solve for x
    x = 116,930.85/408
  6. Step 6: Final answer
    x = 286.60

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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.