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Finding the Fourth Proportional to 445.09, 667.72 and 156.55

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Solution

The fourth proportional to 445.09, 667.72 and 156.55 is: 234.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.09 : 667.72 = 156.55 : x
  2. Step 2: Convert to fraction form
    445.09/667.72 = 156.55/x
  3. Step 3: Cross multiply
    445.09x = 667.72 × 156.55
  4. Step 4: Simplify right side
    445.09x = 104,528.23
  5. Step 5: Solve for x
    x = 104,528.23/445.09
  6. Step 6: Final answer
    x = 234.85

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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.