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Finding the Fourth Proportional to 309.21, 426.78 and 192.75

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Solution

The fourth proportional to 309.21, 426.78 and 192.75 is: 266.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.21 : 426.78 = 192.75 : x
  2. Step 2: Convert to fraction form
    309.21/426.78 = 192.75/x
  3. Step 3: Cross multiply
    309.21x = 426.78 × 192.75
  4. Step 4: Simplify right side
    309.21x = 82,261.85
  5. Step 5: Solve for x
    x = 82,261.85/309.21
  6. Step 6: Final answer
    x = 266.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.