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Finding the Fourth Proportional to 105.36, 145.16 and 80.88

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Solution

The fourth proportional to 105.36, 145.16 and 80.88 is: 111.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.36 : 145.16 = 80.88 : x
  2. Step 2: Convert to fraction form
    105.36/145.16 = 80.88/x
  3. Step 3: Cross multiply
    105.36x = 145.16 × 80.88
  4. Step 4: Simplify right side
    105.36x = 11,740.54
  5. Step 5: Solve for x
    x = 11,740.54/105.36
  6. Step 6: Final answer
    x = 111.43

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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.