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Finding the Fourth Proportional to 104.21, 155.94 and 60.75

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Solution

The fourth proportional to 104.21, 155.94 and 60.75 is: 90.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.21 : 155.94 = 60.75 : x
  2. Step 2: Convert to fraction form
    104.21/155.94 = 60.75/x
  3. Step 3: Cross multiply
    104.21x = 155.94 × 60.75
  4. Step 4: Simplify right side
    104.21x = 9,473.36
  5. Step 5: Solve for x
    x = 9,473.36/104.21
  6. Step 6: Final answer
    x = 90.91

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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.