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Finding the Fourth Proportional to 319.38, 478.91 and 136.67

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Solution

The fourth proportional to 319.38, 478.91 and 136.67 is: 204.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.38 : 478.91 = 136.67 : x
  2. Step 2: Convert to fraction form
    319.38/478.91 = 136.67/x
  3. Step 3: Cross multiply
    319.38x = 478.91 × 136.67
  4. Step 4: Simplify right side
    319.38x = 65,453.27
  5. Step 5: Solve for x
    x = 65,453.27/319.38
  6. Step 6: Final answer
    x = 204.94

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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.