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Finding the Fourth Proportional to 411.16, 616.74 and 122.60

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Solution

The fourth proportional to 411.16, 616.74 and 122.60 is: 183.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.16 : 616.74 = 122.60 : x
  2. Step 2: Convert to fraction form
    411.16/616.74 = 122.60/x
  3. Step 3: Cross multiply
    411.16x = 616.74 × 122.60
  4. Step 4: Simplify right side
    411.16x = 75,608.63
  5. Step 5: Solve for x
    x = 75,608.63/411.16
  6. Step 6: Final answer
    x = 183.89

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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.