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Finding the Fourth Proportional to 318.92, 478.16 and 133.76

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Solution

The fourth proportional to 318.92, 478.16 and 133.76 is: 200.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.92 : 478.16 = 133.76 : x
  2. Step 2: Convert to fraction form
    318.92/478.16 = 133.76/x
  3. Step 3: Cross multiply
    318.92x = 478.16 × 133.76
  4. Step 4: Simplify right side
    318.92x = 63,958.68
  5. Step 5: Solve for x
    x = 63,958.68/318.92
  6. Step 6: Final answer
    x = 200.55

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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.