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Finding the Fourth Proportional to 75.85, 104.09 and 73.91

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Solution

The fourth proportional to 75.85, 104.09 and 73.91 is: 101.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.85 : 104.09 = 73.91 : x
  2. Step 2: Convert to fraction form
    75.85/104.09 = 73.91/x
  3. Step 3: Cross multiply
    75.85x = 104.09 × 73.91
  4. Step 4: Simplify right side
    75.85x = 7,692.40
  5. Step 5: Solve for x
    x = 7,692.40/75.85
  6. Step 6: Final answer
    x = 101.42

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.