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Finding the Fourth Proportional to 319.33, 478.86 and 136.68

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Solution

The fourth proportional to 319.33, 478.86 and 136.68 is: 204.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.33 : 478.86 = 136.68 : x
  2. Step 2: Convert to fraction form
    319.33/478.86 = 136.68/x
  3. Step 3: Cross multiply
    319.33x = 478.86 × 136.68
  4. Step 4: Simplify right side
    319.33x = 65,450.58
  5. Step 5: Solve for x
    x = 65,450.58/319.33
  6. Step 6: Final answer
    x = 204.96

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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.