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Finding the Fourth Proportional to 464.68, 640.96 and 287.68

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Solution

The fourth proportional to 464.68, 640.96 and 287.68 is: 396.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.68 : 640.96 = 287.68 : x
  2. Step 2: Convert to fraction form
    464.68/640.96 = 287.68/x
  3. Step 3: Cross multiply
    464.68x = 640.96 × 287.68
  4. Step 4: Simplify right side
    464.68x = 184,391.37
  5. Step 5: Solve for x
    x = 184,391.37/464.68
  6. Step 6: Final answer
    x = 396.81

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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.