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Finding the Fourth Proportional to 209.28, 313.28 and 163.76

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Solution

The fourth proportional to 209.28, 313.28 and 163.76 is: 245.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.28 : 313.28 = 163.76 : x
  2. Step 2: Convert to fraction form
    209.28/313.28 = 163.76/x
  3. Step 3: Cross multiply
    209.28x = 313.28 × 163.76
  4. Step 4: Simplify right side
    209.28x = 51,302.73
  5. Step 5: Solve for x
    x = 51,302.73/209.28
  6. Step 6: Final answer
    x = 245.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.