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Finding the Fourth Proportional to 126.75, 190.19 and 72.75

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Solution

The fourth proportional to 126.75, 190.19 and 72.75 is: 109.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.75 : 190.19 = 72.75 : x
  2. Step 2: Convert to fraction form
    126.75/190.19 = 72.75/x
  3. Step 3: Cross multiply
    126.75x = 190.19 × 72.75
  4. Step 4: Simplify right side
    126.75x = 13,836.32
  5. Step 5: Solve for x
    x = 13,836.32/126.75
  6. Step 6: Final answer
    x = 109.16

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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.