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Finding the Fourth Proportional to 445.43, 664.86 and 393.53

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Solution

The fourth proportional to 445.43, 664.86 and 393.53 is: 587.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.43 : 664.86 = 393.53 : x
  2. Step 2: Convert to fraction form
    445.43/664.86 = 393.53/x
  3. Step 3: Cross multiply
    445.43x = 664.86 × 393.53
  4. Step 4: Simplify right side
    445.43x = 261,642.36
  5. Step 5: Solve for x
    x = 261,642.36/445.43
  6. Step 6: Final answer
    x = 587.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.