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Finding the Fourth Proportional to 411.62, 617.42 and 123.05

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Solution

The fourth proportional to 411.62, 617.42 and 123.05 is: 184.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.62 : 617.42 = 123.05 : x
  2. Step 2: Convert to fraction form
    411.62/617.42 = 123.05/x
  3. Step 3: Cross multiply
    411.62x = 617.42 × 123.05
  4. Step 4: Simplify right side
    411.62x = 75,975.38
  5. Step 5: Solve for x
    x = 75,975.38/411.62
  6. Step 6: Final answer
    x = 184.58

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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.