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Finding the Fourth Proportional to 286.75, 429.60 and 208.84

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Solution

The fourth proportional to 286.75, 429.60 and 208.84 is: 312.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.75 : 429.60 = 208.84 : x
  2. Step 2: Convert to fraction form
    286.75/429.60 = 208.84/x
  3. Step 3: Cross multiply
    286.75x = 429.60 × 208.84
  4. Step 4: Simplify right side
    286.75x = 89,717.66
  5. Step 5: Solve for x
    x = 89,717.66/286.75
  6. Step 6: Final answer
    x = 312.88

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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.