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Finding the Fourth Proportional to 445.43, 615.62 and 391.41

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Solution

The fourth proportional to 445.43, 615.62 and 391.41 is: 540.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.43 : 615.62 = 391.41 : x
  2. Step 2: Convert to fraction form
    445.43/615.62 = 391.41/x
  3. Step 3: Cross multiply
    445.43x = 615.62 × 391.41
  4. Step 4: Simplify right side
    445.43x = 240,960.80
  5. Step 5: Solve for x
    x = 240,960.80/445.43
  6. Step 6: Final answer
    x = 540.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.