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Finding the Fourth Proportional to 318.13, 439.12 and 193.79

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Solution

The fourth proportional to 318.13, 439.12 and 193.79 is: 267.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.13 : 439.12 = 193.79 : x
  2. Step 2: Convert to fraction form
    318.13/439.12 = 193.79/x
  3. Step 3: Cross multiply
    318.13x = 439.12 × 193.79
  4. Step 4: Simplify right side
    318.13x = 85,098.40
  5. Step 5: Solve for x
    x = 85,098.40/318.13
  6. Step 6: Final answer
    x = 267.50

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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.