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Finding the Fourth Proportional to 445.31, 667.89 and 120.65

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Solution

The fourth proportional to 445.31, 667.89 and 120.65 is: 180.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.31 : 667.89 = 120.65 : x
  2. Step 2: Convert to fraction form
    445.31/667.89 = 120.65/x
  3. Step 3: Cross multiply
    445.31x = 667.89 × 120.65
  4. Step 4: Simplify right side
    445.31x = 80,580.93
  5. Step 5: Solve for x
    x = 80,580.93/445.31
  6. Step 6: Final answer
    x = 180.95

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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.