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Finding the Fourth Proportional to 411.77, 617.66 and 137.81

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Solution

The fourth proportional to 411.77, 617.66 and 137.81 is: 206.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.77 : 617.66 = 137.81 : x
  2. Step 2: Convert to fraction form
    411.77/617.66 = 137.81/x
  3. Step 3: Cross multiply
    411.77x = 617.66 × 137.81
  4. Step 4: Simplify right side
    411.77x = 85,115.95
  5. Step 5: Solve for x
    x = 85,115.95/411.77
  6. Step 6: Final answer
    x = 206.71

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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.