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Finding the Fourth Proportional to 318.36, 476.79 and 163.86

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Solution

The fourth proportional to 318.36, 476.79 and 163.86 is: 245.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.36 : 476.79 = 163.86 : x
  2. Step 2: Convert to fraction form
    318.36/476.79 = 163.86/x
  3. Step 3: Cross multiply
    318.36x = 476.79 × 163.86
  4. Step 4: Simplify right side
    318.36x = 78,124.41
  5. Step 5: Solve for x
    x = 78,124.41/318.36
  6. Step 6: Final answer
    x = 245.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.