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Finding the Fourth Proportional to 300, 450.12 and 191.76

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Solution

The fourth proportional to 300, 450.12 and 191.76 is: 287.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    300 : 450.12 = 191.76 : x
  2. Step 2: Convert to fraction form
    300/450.12 = 191.76/x
  3. Step 3: Cross multiply
    300x = 450.12 × 191.76
  4. Step 4: Simplify right side
    300x = 86,315.01
  5. Step 5: Solve for x
    x = 86,315.01/300
  6. Step 6: Final answer
    x = 287.72

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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.