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Finding the Fourth Proportional to 119.68, 179.16 and 76.84

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Solution

The fourth proportional to 119.68, 179.16 and 76.84 is: 115.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.68 : 179.16 = 76.84 : x
  2. Step 2: Convert to fraction form
    119.68/179.16 = 76.84/x
  3. Step 3: Cross multiply
    119.68x = 179.16 × 76.84
  4. Step 4: Simplify right side
    119.68x = 13,766.65
  5. Step 5: Solve for x
    x = 13,766.65/119.68
  6. Step 6: Final answer
    x = 115.03

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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.