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Finding the Fourth Proportional to 126.75, 190.18 and 53.64

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Solution

The fourth proportional to 126.75, 190.18 and 53.64 is: 80.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.75 : 190.18 = 53.64 : x
  2. Step 2: Convert to fraction form
    126.75/190.18 = 53.64/x
  3. Step 3: Cross multiply
    126.75x = 190.18 × 53.64
  4. Step 4: Simplify right side
    126.75x = 10,200.99
  5. Step 5: Solve for x
    x = 10,200.99/126.75
  6. Step 6: Final answer
    x = 80.48

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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.