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Finding the Fourth Proportional to 76.44, 104.76 and 74.88

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Solution

The fourth proportional to 76.44, 104.76 and 74.88 is: 102.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.44 : 104.76 = 74.88 : x
  2. Step 2: Convert to fraction form
    76.44/104.76 = 74.88/x
  3. Step 3: Cross multiply
    76.44x = 104.76 × 74.88
  4. Step 4: Simplify right side
    76.44x = 7,844.43
  5. Step 5: Solve for x
    x = 7,844.43/76.44
  6. Step 6: Final answer
    x = 102.62

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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.