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Finding the Fourth Proportional to 76.11, 104.90 and 62.80

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Solution

The fourth proportional to 76.11, 104.90 and 62.80 is: 86.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.11 : 104.90 = 62.80 : x
  2. Step 2: Convert to fraction form
    76.11/104.90 = 62.80/x
  3. Step 3: Cross multiply
    76.11x = 104.90 × 62.80
  4. Step 4: Simplify right side
    76.11x = 6,586.88
  5. Step 5: Solve for x
    x = 6,586.88/76.11
  6. Step 6: Final answer
    x = 86.54

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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.