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Finding the Fourth Proportional to 179.58, 268.68 and 128.31

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Solution

The fourth proportional to 179.58, 268.68 and 128.31 is: 191.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.58 : 268.68 = 128.31 : x
  2. Step 2: Convert to fraction form
    179.58/268.68 = 128.31/x
  3. Step 3: Cross multiply
    179.58x = 268.68 × 128.31
  4. Step 4: Simplify right side
    179.58x = 34,474.33
  5. Step 5: Solve for x
    x = 34,474.33/179.58
  6. Step 6: Final answer
    x = 191.97

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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.