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Finding the Fourth Proportional to 126.95, 190.68 and 75.69

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Solution

The fourth proportional to 126.95, 190.68 and 75.69 is: 113.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.95 : 190.68 = 75.69 : x
  2. Step 2: Convert to fraction form
    126.95/190.68 = 75.69/x
  3. Step 3: Cross multiply
    126.95x = 190.68 × 75.69
  4. Step 4: Simplify right side
    126.95x = 14,433.52
  5. Step 5: Solve for x
    x = 14,433.52/126.95
  6. Step 6: Final answer
    x = 113.69

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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.