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Finding the Fourth Proportional to 445.31, 667.86 and 120.68

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Solution

The fourth proportional to 445.31, 667.86 and 120.68 is: 180.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.31 : 667.86 = 120.68 : x
  2. Step 2: Convert to fraction form
    445.31/667.86 = 120.68/x
  3. Step 3: Cross multiply
    445.31x = 667.86 × 120.68
  4. Step 4: Simplify right side
    445.31x = 80,597.34
  5. Step 5: Solve for x
    x = 80,597.34/445.31
  6. Step 6: Final answer
    x = 180.99

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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.