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Finding the Fourth Proportional to 105.12, 144.65 and 80.55

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Solution

The fourth proportional to 105.12, 144.65 and 80.55 is: 110.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.12 : 144.65 = 80.55 : x
  2. Step 2: Convert to fraction form
    105.12/144.65 = 80.55/x
  3. Step 3: Cross multiply
    105.12x = 144.65 × 80.55
  4. Step 4: Simplify right side
    105.12x = 11,651.15
  5. Step 5: Solve for x
    x = 11,651.15/105.12
  6. Step 6: Final answer
    x = 110.84

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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.