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Finding the Fourth Proportional to 104.22, 143.86 and 77.95

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Solution

The fourth proportional to 104.22, 143.86 and 77.95 is: 107.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.22 : 143.86 = 77.95 : x
  2. Step 2: Convert to fraction form
    104.22/143.86 = 77.95/x
  3. Step 3: Cross multiply
    104.22x = 143.86 × 77.95
  4. Step 4: Simplify right side
    104.22x = 11,212.97
  5. Step 5: Solve for x
    x = 11,212.97/104.22
  6. Step 6: Final answer
    x = 107.59

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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.