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Finding the Fourth Proportional to 464.64, 640.91 and 385.49

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Solution

The fourth proportional to 464.64, 640.91 and 385.49 is: 531.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.64 : 640.91 = 385.49 : x
  2. Step 2: Convert to fraction form
    464.64/640.91 = 385.49/x
  3. Step 3: Cross multiply
    464.64x = 640.91 × 385.49
  4. Step 4: Simplify right side
    464.64x = 247,066.96
  5. Step 5: Solve for x
    x = 247,066.96/464.64
  6. Step 6: Final answer
    x = 531.74

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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.