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Finding the Fourth Proportional to 104.08, 143.72 and 80.86

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Solution

The fourth proportional to 104.08, 143.72 and 80.86 is: 111.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.08 : 143.72 = 80.86 : x
  2. Step 2: Convert to fraction form
    104.08/143.72 = 80.86/x
  3. Step 3: Cross multiply
    104.08x = 143.72 × 80.86
  4. Step 4: Simplify right side
    104.08x = 11,620.79
  5. Step 5: Solve for x
    x = 11,620.79/104.08
  6. Step 6: Final answer
    x = 111.65

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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.