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Finding the Fourth Proportional to 411.38, 617.18 and 137.46

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Solution

The fourth proportional to 411.38, 617.18 and 137.46 is: 206.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.38 : 617.18 = 137.46 : x
  2. Step 2: Convert to fraction form
    411.38/617.18 = 137.46/x
  3. Step 3: Cross multiply
    411.38x = 617.18 × 137.46
  4. Step 4: Simplify right side
    411.38x = 84,836.88
  5. Step 5: Solve for x
    x = 84,836.88/411.38
  6. Step 6: Final answer
    x = 206.23

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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.