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Finding the Fourth Proportional to 411.23, 616.85 and 122.65

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Solution

The fourth proportional to 411.23, 616.85 and 122.65 is: 183.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.23 : 616.85 = 122.65 : x
  2. Step 2: Convert to fraction form
    411.23/616.85 = 122.65/x
  3. Step 3: Cross multiply
    411.23x = 616.85 × 122.65
  4. Step 4: Simplify right side
    411.23x = 75,656.65
  5. Step 5: Solve for x
    x = 75,656.65/411.23
  6. Step 6: Final answer
    x = 183.98

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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.