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Finding the Fourth Proportional to 286.81, 429.75 and 209.42

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Solution

The fourth proportional to 286.81, 429.75 and 209.42 is: 313.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.81 : 429.75 = 209.42 : x
  2. Step 2: Convert to fraction form
    286.81/429.75 = 209.42/x
  3. Step 3: Cross multiply
    286.81x = 429.75 × 209.42
  4. Step 4: Simplify right side
    286.81x = 89,996.10
  5. Step 5: Solve for x
    x = 89,996.10/286.81
  6. Step 6: Final answer
    x = 313.79

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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.