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Finding the Fourth Proportional to 179.40, 269.12 and 76.72

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Solution

The fourth proportional to 179.40, 269.12 and 76.72 is: 115.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.40 : 269.12 = 76.72 : x
  2. Step 2: Convert to fraction form
    179.40/269.12 = 76.72/x
  3. Step 3: Cross multiply
    179.40x = 269.12 × 76.72
  4. Step 4: Simplify right side
    179.40x = 20,646.89
  5. Step 5: Solve for x
    x = 20,646.89/179.40
  6. Step 6: Final answer
    x = 115.09

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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.