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Finding the Fourth Proportional to 318.72, 478 and 196.96

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Solution

The fourth proportional to 318.72, 478 and 196.96 is: 295.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.72 : 478 = 196.96 : x
  2. Step 2: Convert to fraction form
    318.72/478 = 196.96/x
  3. Step 3: Cross multiply
    318.72x = 478 × 196.96
  4. Step 4: Simplify right side
    318.72x = 94,146.88
  5. Step 5: Solve for x
    x = 94,146.88/318.72
  6. Step 6: Final answer
    x = 295.39

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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.