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Finding the Fourth Proportional to 464.28, 640.84 and 316.89

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Solution

The fourth proportional to 464.28, 640.84 and 316.89 is: 437.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.28 : 640.84 = 316.89 : x
  2. Step 2: Convert to fraction form
    464.28/640.84 = 316.89/x
  3. Step 3: Cross multiply
    464.28x = 640.84 × 316.89
  4. Step 4: Simplify right side
    464.28x = 203,072.90
  5. Step 5: Solve for x
    x = 203,072.90/464.28
  6. Step 6: Final answer
    x = 437.39

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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.