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Finding the Fourth Proportional to 179.12, 268.78 and 76.39

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Solution

The fourth proportional to 179.12, 268.78 and 76.39 is: 114.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.12 : 268.78 = 76.39 : x
  2. Step 2: Convert to fraction form
    179.12/268.78 = 76.39/x
  3. Step 3: Cross multiply
    179.12x = 268.78 × 76.39
  4. Step 4: Simplify right side
    179.12x = 20,532.10
  5. Step 5: Solve for x
    x = 20,532.10/179.12
  6. Step 6: Final answer
    x = 114.63

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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.