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Finding the Fourth Proportional to 288.21, 397.76 and 163.87

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Solution

The fourth proportional to 288.21, 397.76 and 163.87 is: 226.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.21 : 397.76 = 163.87 : x
  2. Step 2: Convert to fraction form
    288.21/397.76 = 163.87/x
  3. Step 3: Cross multiply
    288.21x = 397.76 × 163.87
  4. Step 4: Simplify right side
    288.21x = 65,179.12
  5. Step 5: Solve for x
    x = 65,179.12/288.21
  6. Step 6: Final answer
    x = 226.15

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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.