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Finding the Fourth Proportional to 447.21, 615.67 and 385.85

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Solution

The fourth proportional to 447.21, 615.67 and 385.85 is: 531.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.21 : 615.67 = 385.85 : x
  2. Step 2: Convert to fraction form
    447.21/615.67 = 385.85/x
  3. Step 3: Cross multiply
    447.21x = 615.67 × 385.85
  4. Step 4: Simplify right side
    447.21x = 237,556.84
  5. Step 5: Solve for x
    x = 237,556.84/447.21
  6. Step 6: Final answer
    x = 531.20

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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.