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Finding the Fourth Proportional to 408.24, 612.40 and 191.68

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Solution

The fourth proportional to 408.24, 612.40 and 191.68 is: 287.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.24 : 612.40 = 191.68 : x
  2. Step 2: Convert to fraction form
    408.24/612.40 = 191.68/x
  3. Step 3: Cross multiply
    408.24x = 612.40 × 191.68
  4. Step 4: Simplify right side
    408.24x = 117,384.83
  5. Step 5: Solve for x
    x = 117,384.83/408.24
  6. Step 6: Final answer
    x = 287.54

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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.