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Finding the Fourth Proportional to 464.46, 640.29 and 287.31

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Solution

The fourth proportional to 464.46, 640.29 and 287.31 is: 396.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.46 : 640.29 = 287.31 : x
  2. Step 2: Convert to fraction form
    464.46/640.29 = 287.31/x
  3. Step 3: Cross multiply
    464.46x = 640.29 × 287.31
  4. Step 4: Simplify right side
    464.46x = 183,961.72
  5. Step 5: Solve for x
    x = 183,961.72/464.46
  6. Step 6: Final answer
    x = 396.08

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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.