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Finding the Fourth Proportional to 445.03, 665.79 and 393.09

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Solution

The fourth proportional to 445.03, 665.79 and 393.09 is: 588.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.03 : 665.79 = 393.09 : x
  2. Step 2: Convert to fraction form
    445.03/665.79 = 393.09/x
  3. Step 3: Cross multiply
    445.03x = 665.79 × 393.09
  4. Step 4: Simplify right side
    445.03x = 261,714.37
  5. Step 5: Solve for x
    x = 261,714.37/445.03
  6. Step 6: Final answer
    x = 588.09

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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.