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Finding the Fourth Proportional to 163.30, 225.45 and 101.21

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Solution

The fourth proportional to 163.30, 225.45 and 101.21 is: 139.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.30 : 225.45 = 101.21 : x
  2. Step 2: Convert to fraction form
    163.30/225.45 = 101.21/x
  3. Step 3: Cross multiply
    163.30x = 225.45 × 101.21
  4. Step 4: Simplify right side
    163.30x = 22,817.79
  5. Step 5: Solve for x
    x = 22,817.79/163.30
  6. Step 6: Final answer
    x = 139.73

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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.