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Finding the Fourth Proportional to 163.40, 225.32 and 121.88

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Solution

The fourth proportional to 163.40, 225.32 and 121.88 is: 168.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.40 : 225.32 = 121.88 : x
  2. Step 2: Convert to fraction form
    163.40/225.32 = 121.88/x
  3. Step 3: Cross multiply
    163.40x = 225.32 × 121.88
  4. Step 4: Simplify right side
    163.40x = 27,461.96
  5. Step 5: Solve for x
    x = 27,461.96/163.40
  6. Step 6: Final answer
    x = 168.07

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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.