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Finding the Fourth Proportional to 318.43, 439.36 and 208.07

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Solution

The fourth proportional to 318.43, 439.36 and 208.07 is: 287.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.43 : 439.36 = 208.07 : x
  2. Step 2: Convert to fraction form
    318.43/439.36 = 208.07/x
  3. Step 3: Cross multiply
    318.43x = 439.36 × 208.07
  4. Step 4: Simplify right side
    318.43x = 91,416.09
  5. Step 5: Solve for x
    x = 91,416.09/318.43
  6. Step 6: Final answer
    x = 287.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.