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Finding the Fourth Proportional to 163.20, 225.22 and 89.51

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Solution

The fourth proportional to 163.20, 225.22 and 89.51 is: 123.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.20 : 225.22 = 89.51 : x
  2. Step 2: Convert to fraction form
    163.20/225.22 = 89.51/x
  3. Step 3: Cross multiply
    163.20x = 225.22 × 89.51
  4. Step 4: Simplify right side
    163.20x = 20,159.44
  5. Step 5: Solve for x
    x = 20,159.44/163.20
  6. Step 6: Final answer
    x = 123.53

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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.