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Finding the Fourth Proportional to 105.96, 146.28 and 81.48

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Solution

The fourth proportional to 105.96, 146.28 and 81.48 is: 112.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.96 : 146.28 = 81.48 : x
  2. Step 2: Convert to fraction form
    105.96/146.28 = 81.48/x
  3. Step 3: Cross multiply
    105.96x = 146.28 × 81.48
  4. Step 4: Simplify right side
    105.96x = 11,918.89
  5. Step 5: Solve for x
    x = 11,918.89/105.96
  6. Step 6: Final answer
    x = 112.48

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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.