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Finding the Fourth Proportional to 289.79, 399.86 and 163.76

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Solution

The fourth proportional to 289.79, 399.86 and 163.76 is: 225.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.79 : 399.86 = 163.76 : x
  2. Step 2: Convert to fraction form
    289.79/399.86 = 163.76/x
  3. Step 3: Cross multiply
    289.79x = 399.86 × 163.76
  4. Step 4: Simplify right side
    289.79x = 65,481.07
  5. Step 5: Solve for x
    x = 65,481.07/289.79
  6. Step 6: Final answer
    x = 225.96

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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.