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Finding the Fourth Proportional to 268.21, 401.69 and 206.85

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Solution

The fourth proportional to 268.21, 401.69 and 206.85 is: 309.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.21 : 401.69 = 206.85 : x
  2. Step 2: Convert to fraction form
    268.21/401.69 = 206.85/x
  3. Step 3: Cross multiply
    268.21x = 401.69 × 206.85
  4. Step 4: Simplify right side
    268.21x = 83,089.58
  5. Step 5: Solve for x
    x = 83,089.58/268.21
  6. Step 6: Final answer
    x = 309.79

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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.