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Finding the Fourth Proportional to 411.71, 617.56 and 137.84

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Solution

The fourth proportional to 411.71, 617.56 and 137.84 is: 206.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.71 : 617.56 = 137.84 : x
  2. Step 2: Convert to fraction form
    411.71/617.56 = 137.84/x
  3. Step 3: Cross multiply
    411.71x = 617.56 × 137.84
  4. Step 4: Simplify right side
    411.71x = 85,121.04
  5. Step 5: Solve for x
    x = 85,121.04/411.71
  6. Step 6: Final answer
    x = 206.75

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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.