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Finding the Fourth Proportional to 179.68, 269.36 and 76.84

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Solution

The fourth proportional to 179.68, 269.36 and 76.84 is: 115.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.68 : 269.36 = 76.84 : x
  2. Step 2: Convert to fraction form
    179.68/269.36 = 76.84/x
  3. Step 3: Cross multiply
    179.68x = 269.36 × 76.84
  4. Step 4: Simplify right side
    179.68x = 20,697.62
  5. Step 5: Solve for x
    x = 20,697.62/179.68
  6. Step 6: Final answer
    x = 115.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.