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Finding the Fourth Proportional to 179.40, 269.08 and 76.64

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Solution

The fourth proportional to 179.40, 269.08 and 76.64 is: 114.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.40 : 269.08 = 76.64 : x
  2. Step 2: Convert to fraction form
    179.40/269.08 = 76.64/x
  3. Step 3: Cross multiply
    179.40x = 269.08 × 76.64
  4. Step 4: Simplify right side
    179.40x = 20,622.29
  5. Step 5: Solve for x
    x = 20,622.29/179.40
  6. Step 6: Final answer
    x = 114.95

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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.