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Finding the Fourth Proportional to 76.11, 104.85 and 63.90

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Solution

The fourth proportional to 76.11, 104.85 and 63.90 is: 88.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.11 : 104.85 = 63.90 : x
  2. Step 2: Convert to fraction form
    76.11/104.85 = 63.90/x
  3. Step 3: Cross multiply
    76.11x = 104.85 × 63.90
  4. Step 4: Simplify right side
    76.11x = 6,699.92
  5. Step 5: Solve for x
    x = 6,699.92/76.11
  6. Step 6: Final answer
    x = 88.03

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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.