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Finding the Fourth Proportional to 408.94, 612.90 and 192.07

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Solution

The fourth proportional to 408.94, 612.90 and 192.07 is: 287.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.94 : 612.90 = 192.07 : x
  2. Step 2: Convert to fraction form
    408.94/612.90 = 192.07/x
  3. Step 3: Cross multiply
    408.94x = 612.90 × 192.07
  4. Step 4: Simplify right side
    408.94x = 117,719.70
  5. Step 5: Solve for x
    x = 117,719.70/408.94
  6. Step 6: Final answer
    x = 287.87

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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.