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Finding the Fourth Proportional to 104.29, 156.42 and 85

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Solution

The fourth proportional to 104.29, 156.42 and 85 is: 127.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.29 : 156.42 = 85 : x
  2. Step 2: Convert to fraction form
    104.29/156.42 = 85/x
  3. Step 3: Cross multiply
    104.29x = 156.42 × 85
  4. Step 4: Simplify right side
    104.29x = 13,295.70
  5. Step 5: Solve for x
    x = 13,295.70/104.29
  6. Step 6: Final answer
    x = 127.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.