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Finding the Fourth Proportional to 289.28, 399.20 and 163.24

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Solution

The fourth proportional to 289.28, 399.20 and 163.24 is: 225.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.28 : 399.20 = 163.24 : x
  2. Step 2: Convert to fraction form
    289.28/399.20 = 163.24/x
  3. Step 3: Cross multiply
    289.28x = 399.20 × 163.24
  4. Step 4: Simplify right side
    289.28x = 65,163.59
  5. Step 5: Solve for x
    x = 65,163.59/289.28
  6. Step 6: Final answer
    x = 225.26

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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.