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Finding the Fourth Proportional to 206.80, 309.80 and 161

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Solution

The fourth proportional to 206.80, 309.80 and 161 is: 241.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.80 : 309.80 = 161 : x
  2. Step 2: Convert to fraction form
    206.80/309.80 = 161/x
  3. Step 3: Cross multiply
    206.80x = 309.80 × 161
  4. Step 4: Simplify right side
    206.80x = 49,877.80
  5. Step 5: Solve for x
    x = 49,877.80/206.80
  6. Step 6: Final answer
    x = 241.19

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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.