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Finding the Fourth Proportional to 163.47, 225.20 and 121.94

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Solution

The fourth proportional to 163.47, 225.20 and 121.94 is: 168.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.47 : 225.20 = 121.94 : x
  2. Step 2: Convert to fraction form
    163.47/225.20 = 121.94/x
  3. Step 3: Cross multiply
    163.47x = 225.20 × 121.94
  4. Step 4: Simplify right side
    163.47x = 27,461.76
  5. Step 5: Solve for x
    x = 27,461.76/163.47
  6. Step 6: Final answer
    x = 168.00

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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.