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Finding the Fourth Proportional to 411.20, 616.80 and 195.20

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Solution

The fourth proportional to 411.20, 616.80 and 195.20 is: 292.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.20 : 616.80 = 195.20 : x
  2. Step 2: Convert to fraction form
    411.20/616.80 = 195.20/x
  3. Step 3: Cross multiply
    411.20x = 616.80 × 195.20
  4. Step 4: Simplify right side
    411.20x = 120,399.36
  5. Step 5: Solve for x
    x = 120,399.36/411.20
  6. Step 6: Final answer
    x = 292.80

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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.