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Finding the Fourth Proportional to 190.78, 286.25 and 69.03

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Solution

The fourth proportional to 190.78, 286.25 and 69.03 is: 103.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.78 : 286.25 = 69.03 : x
  2. Step 2: Convert to fraction form
    190.78/286.25 = 69.03/x
  3. Step 3: Cross multiply
    190.78x = 286.25 × 69.03
  4. Step 4: Simplify right side
    190.78x = 19,759.84
  5. Step 5: Solve for x
    x = 19,759.84/190.78
  6. Step 6: Final answer
    x = 103.57

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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.