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Finding the Fourth Proportional to 163.31, 225.36 and 89.62

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Solution

The fourth proportional to 163.31, 225.36 and 89.62 is: 123.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.31 : 225.36 = 89.62 : x
  2. Step 2: Convert to fraction form
    163.31/225.36 = 89.62/x
  3. Step 3: Cross multiply
    163.31x = 225.36 × 89.62
  4. Step 4: Simplify right side
    163.31x = 20,197.36
  5. Step 5: Solve for x
    x = 20,197.36/163.31
  6. Step 6: Final answer
    x = 123.68

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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.