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Finding the Fourth Proportional to 76.08, 104.79 and 75.68

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Solution

The fourth proportional to 76.08, 104.79 and 75.68 is: 104.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.08 : 104.79 = 75.68 : x
  2. Step 2: Convert to fraction form
    76.08/104.79 = 75.68/x
  3. Step 3: Cross multiply
    76.08x = 104.79 × 75.68
  4. Step 4: Simplify right side
    76.08x = 7,929.98
  5. Step 5: Solve for x
    x = 7,929.98/76.08
  6. Step 6: Final answer
    x = 104.23

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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.