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Finding the Fourth Proportional to 288.09, 397.61 and 163.76

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Solution

The fourth proportional to 288.09, 397.61 and 163.76 is: 226.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.09 : 397.61 = 163.76 : x
  2. Step 2: Convert to fraction form
    288.09/397.61 = 163.76/x
  3. Step 3: Cross multiply
    288.09x = 397.61 × 163.76
  4. Step 4: Simplify right side
    288.09x = 65,109.81
  5. Step 5: Solve for x
    x = 65,109.81/288.09
  6. Step 6: Final answer
    x = 226.01

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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.