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Finding the Fourth Proportional to 126.78, 173.80 and 124.88

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Solution

The fourth proportional to 126.78, 173.80 and 124.88 is: 171.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.78 : 173.80 = 124.88 : x
  2. Step 2: Convert to fraction form
    126.78/173.80 = 124.88/x
  3. Step 3: Cross multiply
    126.78x = 173.80 × 124.88
  4. Step 4: Simplify right side
    126.78x = 21,704.14
  5. Step 5: Solve for x
    x = 21,704.14/126.78
  6. Step 6: Final answer
    x = 171.20

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.