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Finding the Fourth Proportional to 445.30, 667.91 and 120.69

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Solution

The fourth proportional to 445.30, 667.91 and 120.69 is: 181.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.30 : 667.91 = 120.69 : x
  2. Step 2: Convert to fraction form
    445.30/667.91 = 120.69/x
  3. Step 3: Cross multiply
    445.30x = 667.91 × 120.69
  4. Step 4: Simplify right side
    445.30x = 80,610.36
  5. Step 5: Solve for x
    x = 80,610.36/445.30
  6. Step 6: Final answer
    x = 181.03

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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.