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Finding the Fourth Proportional to 253.92, 380.78 and 163.20

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Solution

The fourth proportional to 253.92, 380.78 and 163.20 is: 244.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.92 : 380.78 = 163.20 : x
  2. Step 2: Convert to fraction form
    253.92/380.78 = 163.20/x
  3. Step 3: Cross multiply
    253.92x = 380.78 × 163.20
  4. Step 4: Simplify right side
    253.92x = 62,143.09
  5. Step 5: Solve for x
    x = 62,143.09/253.92
  6. Step 6: Final answer
    x = 244.73

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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.