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Finding the Fourth Proportional to 288.20, 397.72 and 163.86

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Solution

The fourth proportional to 288.20, 397.72 and 163.86 is: 226.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.20 : 397.72 = 163.86 : x
  2. Step 2: Convert to fraction form
    288.20/397.72 = 163.86/x
  3. Step 3: Cross multiply
    288.20x = 397.72 × 163.86
  4. Step 4: Simplify right side
    288.20x = 65,168.41
  5. Step 5: Solve for x
    x = 65,168.41/288.20
  6. Step 6: Final answer
    x = 226.12

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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.