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Finding the Fourth Proportional to 411.39, 617.11 and 129.93

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Solution

The fourth proportional to 411.39, 617.11 and 129.93 is: 194.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.39 : 617.11 = 129.93 : x
  2. Step 2: Convert to fraction form
    411.39/617.11 = 129.93/x
  3. Step 3: Cross multiply
    411.39x = 617.11 × 129.93
  4. Step 4: Simplify right side
    411.39x = 80,181.10
  5. Step 5: Solve for x
    x = 80,181.10/411.39
  6. Step 6: Final answer
    x = 194.90

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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.