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Finding the Fourth Proportional to 163.89, 225.92 and 111.40

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Solution

The fourth proportional to 163.89, 225.92 and 111.40 is: 153.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.89 : 225.92 = 111.40 : x
  2. Step 2: Convert to fraction form
    163.89/225.92 = 111.40/x
  3. Step 3: Cross multiply
    163.89x = 225.92 × 111.40
  4. Step 4: Simplify right side
    163.89x = 25,167.20
  5. Step 5: Solve for x
    x = 25,167.20/163.89
  6. Step 6: Final answer
    x = 153.56

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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.