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Finding the Fourth Proportional to 445.97, 615.34 and 321.91

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Solution

The fourth proportional to 445.97, 615.34 and 321.91 is: 444.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.97 : 615.34 = 321.91 : x
  2. Step 2: Convert to fraction form
    445.97/615.34 = 321.91/x
  3. Step 3: Cross multiply
    445.97x = 615.34 × 321.91
  4. Step 4: Simplify right side
    445.97x = 198,084.10
  5. Step 5: Solve for x
    x = 198,084.10/445.97
  6. Step 6: Final answer
    x = 444.16

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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.