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Finding the Fourth Proportional to 445.12, 666.64 and 329.12

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Solution

The fourth proportional to 445.12, 666.64 and 329.12 is: 492.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.12 : 666.64 = 329.12 : x
  2. Step 2: Convert to fraction form
    445.12/666.64 = 329.12/x
  3. Step 3: Cross multiply
    445.12x = 666.64 × 329.12
  4. Step 4: Simplify right side
    445.12x = 219,404.56
  5. Step 5: Solve for x
    x = 219,404.56/445.12
  6. Step 6: Final answer
    x = 492.91

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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.