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Finding the Fourth Proportional to 318.05, 438.79 and 199.97

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Solution

The fourth proportional to 318.05, 438.79 and 199.97 is: 275.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.05 : 438.79 = 199.97 : x
  2. Step 2: Convert to fraction form
    318.05/438.79 = 199.97/x
  3. Step 3: Cross multiply
    318.05x = 438.79 × 199.97
  4. Step 4: Simplify right side
    318.05x = 87,741.64
  5. Step 5: Solve for x
    x = 87,741.64/318.05
  6. Step 6: Final answer
    x = 275.88

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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.