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Finding the Fourth Proportional to 319.26, 478.62 and 126.78

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Solution

The fourth proportional to 319.26, 478.62 and 126.78 is: 190.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.26 : 478.62 = 126.78 : x
  2. Step 2: Convert to fraction form
    319.26/478.62 = 126.78/x
  3. Step 3: Cross multiply
    319.26x = 478.62 × 126.78
  4. Step 4: Simplify right side
    319.26x = 60,679.44
  5. Step 5: Solve for x
    x = 60,679.44/319.26
  6. Step 6: Final answer
    x = 190.06

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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.