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Finding the Fourth Proportional to 308.87, 426.09 and 190.75

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Solution

The fourth proportional to 308.87, 426.09 and 190.75 is: 263.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.87 : 426.09 = 190.75 : x
  2. Step 2: Convert to fraction form
    308.87/426.09 = 190.75/x
  3. Step 3: Cross multiply
    308.87x = 426.09 × 190.75
  4. Step 4: Simplify right side
    308.87x = 81,274.54
  5. Step 5: Solve for x
    x = 81,274.54/308.87
  6. Step 6: Final answer
    x = 263.14

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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.