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Finding the Fourth Proportional to 445.43, 664.71 and 391.44

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Solution

The fourth proportional to 445.43, 664.71 and 391.44 is: 584.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.43 : 664.71 = 391.44 : x
  2. Step 2: Convert to fraction form
    445.43/664.71 = 391.44/x
  3. Step 3: Cross multiply
    445.43x = 664.71 × 391.44
  4. Step 4: Simplify right side
    445.43x = 260,194.08
  5. Step 5: Solve for x
    x = 260,194.08/445.43
  6. Step 6: Final answer
    x = 584.14

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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.