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Finding the Fourth Proportional to 318.21, 439.12 and 193.91

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Solution

The fourth proportional to 318.21, 439.12 and 193.91 is: 267.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.21 : 439.12 = 193.91 : x
  2. Step 2: Convert to fraction form
    318.21/439.12 = 193.91/x
  3. Step 3: Cross multiply
    318.21x = 439.12 × 193.91
  4. Step 4: Simplify right side
    318.21x = 85,147.81
  5. Step 5: Solve for x
    x = 85,147.81/318.21
  6. Step 6: Final answer
    x = 267.59

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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.