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Finding the Fourth Proportional to 318.28, 439.30 and 193.96

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Solution

The fourth proportional to 318.28, 439.30 and 193.96 is: 267.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.28 : 439.30 = 193.96 : x
  2. Step 2: Convert to fraction form
    318.28/439.30 = 193.96/x
  3. Step 3: Cross multiply
    318.28x = 439.30 × 193.96
  4. Step 4: Simplify right side
    318.28x = 85,206.63
  5. Step 5: Solve for x
    x = 85,206.63/318.28
  6. Step 6: Final answer
    x = 267.71

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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.