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Finding the Fourth Proportional to 206.80, 310.18 and 69.84

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Solution

The fourth proportional to 206.80, 310.18 and 69.84 is: 104.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.80 : 310.18 = 69.84 : x
  2. Step 2: Convert to fraction form
    206.80/310.18 = 69.84/x
  3. Step 3: Cross multiply
    206.80x = 310.18 × 69.84
  4. Step 4: Simplify right side
    206.80x = 21,662.97
  5. Step 5: Solve for x
    x = 21,662.97/206.80
  6. Step 6: Final answer
    x = 104.75

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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.