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Finding the Fourth Proportional to 163.92, 226.21 and 90.23

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Solution

The fourth proportional to 163.92, 226.21 and 90.23 is: 124.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.92 : 226.21 = 90.23 : x
  2. Step 2: Convert to fraction form
    163.92/226.21 = 90.23/x
  3. Step 3: Cross multiply
    163.92x = 226.21 × 90.23
  4. Step 4: Simplify right side
    163.92x = 20,410.48
  5. Step 5: Solve for x
    x = 20,410.48/163.92
  6. Step 6: Final answer
    x = 124.51

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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.