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Finding the Fourth Proportional to 464.05, 639.84 and 385.46

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Solution

The fourth proportional to 464.05, 639.84 and 385.46 is: 531.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.05 : 639.84 = 385.46 : x
  2. Step 2: Convert to fraction form
    464.05/639.84 = 385.46/x
  3. Step 3: Cross multiply
    464.05x = 639.84 × 385.46
  4. Step 4: Simplify right side
    464.05x = 246,630.97
  5. Step 5: Solve for x
    x = 246,630.97/464.05
  6. Step 6: Final answer
    x = 531.48

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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.