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Finding the Fourth Proportional to 190.76, 286.20 and 163.40

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Solution

The fourth proportional to 190.76, 286.20 and 163.40 is: 245.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.76 : 286.20 = 163.40 : x
  2. Step 2: Convert to fraction form
    190.76/286.20 = 163.40/x
  3. Step 3: Cross multiply
    190.76x = 286.20 × 163.40
  4. Step 4: Simplify right side
    190.76x = 46,765.08
  5. Step 5: Solve for x
    x = 46,765.08/190.76
  6. Step 6: Final answer
    x = 245.15

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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.