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Finding the Fourth Proportional to 190.44, 285.44 and 86.30

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Solution

The fourth proportional to 190.44, 285.44 and 86.30 is: 129.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.44 : 285.44 = 86.30 : x
  2. Step 2: Convert to fraction form
    190.44/285.44 = 86.30/x
  3. Step 3: Cross multiply
    190.44x = 285.44 × 86.30
  4. Step 4: Simplify right side
    190.44x = 24,634.56
  5. Step 5: Solve for x
    x = 24,634.56/190.44
  6. Step 6: Final answer
    x = 129.36

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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.