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Finding the Fourth Proportional to 104.12, 155.84 and 90.75

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Solution

The fourth proportional to 104.12, 155.84 and 90.75 is: 135.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.12 : 155.84 = 90.75 : x
  2. Step 2: Convert to fraction form
    104.12/155.84 = 90.75/x
  3. Step 3: Cross multiply
    104.12x = 155.84 × 90.75
  4. Step 4: Simplify right side
    104.12x = 14,142.03
  5. Step 5: Solve for x
    x = 14,142.03/104.12
  6. Step 6: Final answer
    x = 135.83

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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.