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Finding the Fourth Proportional to 464.44, 640.30 and 385.47

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Solution

The fourth proportional to 464.44, 640.30 and 385.47 is: 531.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.44 : 640.30 = 385.47 : x
  2. Step 2: Convert to fraction form
    464.44/640.30 = 385.47/x
  3. Step 3: Cross multiply
    464.44x = 640.30 × 385.47
  4. Step 4: Simplify right side
    464.44x = 246,816.44
  5. Step 5: Solve for x
    x = 246,816.44/464.44
  6. Step 6: Final answer
    x = 531.43

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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.