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Finding the Fourth Proportional to 104.20, 143.42 and 95

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Solution

The fourth proportional to 104.20, 143.42 and 95 is: 130.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.20 : 143.42 = 95 : x
  2. Step 2: Convert to fraction form
    104.20/143.42 = 95/x
  3. Step 3: Cross multiply
    104.20x = 143.42 × 95
  4. Step 4: Simplify right side
    104.20x = 13,624.90
  5. Step 5: Solve for x
    x = 13,624.90/104.20
  6. Step 6: Final answer
    x = 130.76

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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.