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Finding the Fourth Proportional to 411.98, 617.49 and 206.70

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Solution

The fourth proportional to 411.98, 617.49 and 206.70 is: 309.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.98 : 617.49 = 206.70 : x
  2. Step 2: Convert to fraction form
    411.98/617.49 = 206.70/x
  3. Step 3: Cross multiply
    411.98x = 617.49 × 206.70
  4. Step 4: Simplify right side
    411.98x = 127,632.87
  5. Step 5: Solve for x
    x = 127,632.87/411.98
  6. Step 6: Final answer
    x = 309.81

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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.