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Finding the Fourth Proportional to 445.55, 664.89 and 391.56

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Solution

The fourth proportional to 445.55, 664.89 and 391.56 is: 584.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.55 : 664.89 = 391.56 : x
  2. Step 2: Convert to fraction form
    445.55/664.89 = 391.56/x
  3. Step 3: Cross multiply
    445.55x = 664.89 × 391.56
  4. Step 4: Simplify right side
    445.55x = 260,344.33
  5. Step 5: Solve for x
    x = 260,344.33/445.55
  6. Step 6: Final answer
    x = 584.32

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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.