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Finding the Fourth Proportional to 126.95, 190.49 and 85.79

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Solution

The fourth proportional to 126.95, 190.49 and 85.79 is: 128.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.95 : 190.49 = 85.79 : x
  2. Step 2: Convert to fraction form
    126.95/190.49 = 85.79/x
  3. Step 3: Cross multiply
    126.95x = 190.49 × 85.79
  4. Step 4: Simplify right side
    126.95x = 16,342.18
  5. Step 5: Solve for x
    x = 16,342.18/126.95
  6. Step 6: Final answer
    x = 128.73

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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.